Cleanup: Nodes, Clang-Tidy else-after-return fixes

This addresses warnings from Clang-Tidy's `readability-else-after-return`
rule in the `source/blender/nodes` module.

No functional changes.

source/blender/nodes/intern/node_common.c

@@ -84,13 +84,11 @@ bool node_group_poll_instance(bNode *node, bNodeTree *nodetree)
     if (grouptree) {
       return nodeGroupPoll(nodetree, grouptree);
     }
-    else {
-      return true; /* without a linked node tree, group node is always ok */
-    }
-  }
-  else {
-    return false;
+
+    return true; /* without a linked node tree, group node is always ok */
   }
+
+  return false;
 }
 
 int nodeGroupPoll(bNodeTree *nodetree, bNodeTree *grouptree)

source/blender/nodes/intern/node_tree_multi_function.cc

@@ -176,13 +176,12 @@ static fn::MFOutputSocket *try_find_origin(CommonMFNetworkBuilderData &common,
     }
     return nullptr;
   }
-  else {
-    const DGroupInput &from_group_input = *from_group_inputs[0];
-    if (is_multi_function_data_socket(from_group_input.bsocket())) {
-      return &common.network_map.lookup(from_group_input);
-    }
-    return nullptr;
+
+  const DGroupInput &from_group_input = *from_group_inputs[0];
+  if (is_multi_function_data_socket(from_group_input.bsocket())) {
+    return &common.network_map.lookup(from_group_input);
   }
+  return nullptr;
 }
 
 using ImplicitConversionsMap =

source/blender/nodes/shader/nodes/node_shader_attribute.c

@@ -55,17 +55,16 @@ static int node_shader_gpu_attribute(GPUMaterial *mat,
 
     return 1;
   }
-  else {
-    GPUNodeLink *cd_attr = GPU_attribute(mat, CD_AUTO_FROM_NAME, attr->name);
-    GPU_stack_link(mat, node, "node_attribute", in, out, cd_attr);
 
-    /* for each output. */
-    for (int i = 0; sh_node_attribute_out[i].type != -1; i++) {
-      node_shader_gpu_bump_tex_coord(mat, node, &out[i].link);
-    }
+  GPUNodeLink *cd_attr = GPU_attribute(mat, CD_AUTO_FROM_NAME, attr->name);
+  GPU_stack_link(mat, node, "node_attribute", in, out, cd_attr);
 
-    return 1;
+  /* for each output. */
+  for (int i = 0; sh_node_attribute_out[i].type != -1; i++) {
+    node_shader_gpu_bump_tex_coord(mat, node, &out[i].link);
   }
+
+  return 1;
 }
 
 /* node type definition */

source/blender/nodes/shader/nodes/node_shader_clamp.cc

@@ -60,9 +60,8 @@ static void sh_node_clamp_expand_in_mf_network(blender::nodes::NodeMFNetworkBuil
         if (a < b) {
           return clamp_f(value, a, b);
         }
-        else {
-          return clamp_f(value, b, a);
-        }
+
+        return clamp_f(value, b, a);
       }};
 
   int clamp_type = builder.bnode().custom1;

source/blender/nodes/shader/nodes/node_shader_curves.c

@@ -215,20 +215,19 @@ static int gpu_shader_curve_rgb(GPUMaterial *mat,
                           GPU_uniform(range_rgba),
                           GPU_uniform(ext_rgba[3]));
   }
-  else {
-    return GPU_stack_link(mat,
-                          node,
-                          "curves_rgb",
-                          in,
-                          out,
-                          tex,
-                          GPU_constant(&layer),
-                          GPU_uniform(range_rgba),
-                          GPU_uniform(ext_rgba[0]),
-                          GPU_uniform(ext_rgba[1]),
-                          GPU_uniform(ext_rgba[2]),
-                          GPU_uniform(ext_rgba[3]));
-  }
+
+  return GPU_stack_link(mat,
+                        node,
+                        "curves_rgb",
+                        in,
+                        out,
+                        tex,
+                        GPU_constant(&layer),
+                        GPU_uniform(range_rgba),
+                        GPU_uniform(ext_rgba[0]),
+                        GPU_uniform(ext_rgba[1]),
+                        GPU_uniform(ext_rgba[2]),
+                        GPU_uniform(ext_rgba[3]));
 }
 
 void register_node_type_sh_curve_rgb(void)

source/blender/nodes/shader/nodes/node_shader_displacement.c

@@ -64,10 +64,9 @@ static int gpu_shader_displacement(GPUMaterial *mat,
     return GPU_stack_link(
         mat, node, "node_displacement_object", in, out, GPU_builtin(GPU_OBJECT_MATRIX));
   }
-  else {
-    return GPU_stack_link(
-        mat, node, "node_displacement_world", in, out, GPU_builtin(GPU_OBJECT_MATRIX));
-  }
+
+  return GPU_stack_link(
+      mat, node, "node_displacement_world", in, out, GPU_builtin(GPU_OBJECT_MATRIX));
 }
 
 /* node type definition */

source/blender/nodes/shader/nodes/node_shader_mapping.c

@@ -53,9 +53,8 @@ static int gpu_shader_mapping(GPUMaterial *mat,
   if (node->custom1 < ARRAY_SIZE(names) && names[node->custom1]) {
     return GPU_stack_link(mat, node, names[node->custom1], in, out);
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 static void node_shader_update_mapping(bNodeTree *UNUSED(ntree), bNode *node)

source/blender/nodes/shader/nodes/node_shader_math.cc

@@ -141,9 +141,8 @@ static int gpu_shader_math(GPUMaterial *mat,
     }
     return ret;
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 static const blender::fn::MultiFunction &get_base_multi_function(

source/blender/nodes/shader/nodes/node_shader_mixRgb.c

@@ -98,9 +98,8 @@ static int gpu_shader_mix_rgb(GPUMaterial *mat,
     }
     return ret;
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 void register_node_type_sh_mix_rgb(void)

source/blender/nodes/shader/nodes/node_shader_tangent.c

@@ -45,28 +45,27 @@ static int node_shader_gpu_tangent(GPUMaterial *mat,
     return GPU_stack_link(
         mat, node, "node_tangentmap", in, out, GPU_attribute(mat, CD_TANGENT, attr->uv_map));
   }
-  else {
-    GPUNodeLink *orco = GPU_attribute(mat, CD_ORCO, "");
 
-    if (attr->axis == SHD_TANGENT_AXIS_X) {
-      GPU_link(mat, "tangent_orco_x", orco, &orco);
-    }
-    else if (attr->axis == SHD_TANGENT_AXIS_Y) {
-      GPU_link(mat, "tangent_orco_y", orco, &orco);
-    }
-    else {
-      GPU_link(mat, "tangent_orco_z", orco, &orco);
-    }
+  GPUNodeLink *orco = GPU_attribute(mat, CD_ORCO, "");
 
-    return GPU_stack_link(mat,
-                          node,
-                          "node_tangent",
-                          in,
-                          out,
-                          GPU_builtin(GPU_WORLD_NORMAL),
-                          orco,
-                          GPU_builtin(GPU_OBJECT_MATRIX));
+  if (attr->axis == SHD_TANGENT_AXIS_X) {
+    GPU_link(mat, "tangent_orco_x", orco, &orco);
   }
+  else if (attr->axis == SHD_TANGENT_AXIS_Y) {
+    GPU_link(mat, "tangent_orco_y", orco, &orco);
+  }
+  else {
+    GPU_link(mat, "tangent_orco_z", orco, &orco);
+  }
+
+  return GPU_stack_link(mat,
+                        node,
+                        "node_tangent",
+                        in,
+                        out,
+                        GPU_builtin(GPU_WORLD_NORMAL),
+                        orco,
+                        GPU_builtin(GPU_OBJECT_MATRIX));
 }
 
 /* node type definition */

source/blender/nodes/shader/nodes/node_shader_tex_sky.c

@@ -170,7 +170,7 @@ static int node_shader_gpu_tex_sky(GPUMaterial *mat,
                           GPU_uniform(xyz_to_rgb.g),
                           GPU_uniform(xyz_to_rgb.b));
   }
-  else if (tex->sky_model == 1) {
+  if (tex->sky_model == 1) {
     /* Hosek / Wilkie */
     sun_angles[0] = fmin(M_PI_2, sun_angles[0]); /* clamp to horizon */
     SKY_ArHosekSkyModelState *sky_state = SKY_arhosek_xyz_skymodelstate_alloc_init(
@@ -210,9 +210,8 @@ static int node_shader_gpu_tex_sky(GPUMaterial *mat,
                           GPU_uniform(xyz_to_rgb.g),
                           GPU_uniform(xyz_to_rgb.b));
   }
-  else {
-    return GPU_stack_link(mat, node, "node_tex_sky_nishita", in, out);
-  }
+
+  return GPU_stack_link(mat, node, "node_tex_sky_nishita", in, out);
 }
 
 static void node_shader_update_sky(bNodeTree *UNUSED(ntree), bNode *node)

source/blender/nodes/shader/nodes/node_shader_tex_white_noise.c

@@ -54,9 +54,8 @@ static int gpu_shader_tex_white_noise(GPUMaterial *mat,
   if (node->custom1 < ARRAY_SIZE(names) && names[node->custom1]) {
     return GPU_stack_link(mat, node, names[node->custom1], in, out);
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 static void node_shader_update_tex_white_noise(bNodeTree *UNUSED(ntree), bNode *node)

source/blender/nodes/shader/nodes/node_shader_valToRgb.cc

@@ -121,9 +121,8 @@ static int gpu_shader_valtorgb(GPUMaterial *mat,
   if (coba->ipotype == COLBAND_INTERP_CONSTANT) {
     return GPU_stack_link(mat, node, "valtorgb_nearest", in, out, tex, GPU_constant(&layer));
   }
-  else {
-    return GPU_stack_link(mat, node, "valtorgb", in, out, tex, GPU_constant(&layer));
-  }
+
+  return GPU_stack_link(mat, node, "valtorgb", in, out, tex, GPU_constant(&layer));
 }
 
 class ColorBandFunction : public blender::fn::MultiFunction {

source/blender/nodes/shader/nodes/node_shader_vector_displacement.c

@@ -55,13 +55,12 @@ static int gpu_shader_vector_displacement(GPUMaterial *mat,
                           GPU_builtin(GPU_OBJECT_MATRIX),
                           GPU_builtin(GPU_VIEW_MATRIX));
   }
-  else if (node->custom1 == SHD_SPACE_OBJECT) {
+  if (node->custom1 == SHD_SPACE_OBJECT) {
     return GPU_stack_link(
         mat, node, "node_vector_displacement_object", in, out, GPU_builtin(GPU_OBJECT_MATRIX));
   }
-  else {
-    return GPU_stack_link(mat, node, "node_vector_displacement_world", in, out);
-  }
+
+  return GPU_stack_link(mat, node, "node_vector_displacement_world", in, out);
 }
 
 /* node type definition */

source/blender/nodes/shader/nodes/node_shader_vector_math.cc

@@ -103,9 +103,8 @@ static int gpu_shader_vector_math(GPUMaterial *mat,
   if (name != nullptr) {
     return GPU_stack_link(mat, node, name, in, out);
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 static void node_shader_update_vector_math(bNodeTree *UNUSED(ntree), bNode *node)

source/blender/nodes/shader/nodes/node_shader_vector_rotate.c

@@ -53,9 +53,8 @@ static int gpu_shader_vector_rotate(GPUMaterial *mat,
     float invert = (node->custom2) ? -1.0 : 1.0;
     return GPU_stack_link(mat, node, names[node->custom1], in, out, GPU_constant(&invert));
   }
-  else {
-    return 0;
-  }
+
+  return 0;
 }
 
 static void node_shader_update_vector_rotate(bNodeTree *UNUSED(ntree), bNode *node)

source/blender/nodes/shader/nodes/node_shader_wireframe.c

@@ -42,15 +42,14 @@ static int node_shader_gpu_wireframe(GPUMaterial *mat,
     return GPU_stack_link(
         mat, node, "node_wireframe_screenspace", in, out, GPU_builtin(GPU_BARYCENTRIC_TEXCO));
   }
-  else {
-    return GPU_stack_link(mat,
-                          node,
-                          "node_wireframe",
-                          in,
-                          out,
-                          GPU_builtin(GPU_BARYCENTRIC_TEXCO),
-                          GPU_builtin(GPU_BARYCENTRIC_DIST));
-  }
+
+  return GPU_stack_link(mat,
+                        node,
+                        "node_wireframe",
+                        in,
+                        out,
+                        GPU_builtin(GPU_BARYCENTRIC_TEXCO),
+                        GPU_builtin(GPU_BARYCENTRIC_DIST));
 }
 
 /* node type definition */

source/blender/nodes/texture/node_texture_util.c

@@ -145,14 +145,13 @@ void tex_output(bNode *node,
     /* do not add a delegate if the node is muted */
     return;
   }
+
+  if (!out->data) {
+    /* Freed in tex_end_exec (node.c) */
+    dg = out->data = MEM_mallocN(sizeof(TexDelegate), "tex delegate");
+  }
   else {
-    if (!out->data) {
-      /* Freed in tex_end_exec (node.c) */
-      dg = out->data = MEM_mallocN(sizeof(TexDelegate), "tex delegate");
-    }
-    else {
-      dg = out->data;
-    }
+    dg = out->data;
   }
 
   dg->cdata = cdata;