Cleanup: Clang-tidy, modernize-use-nullptr.

source/blender/blenkernel/intern/volume.cc

@@ -1142,7 +1142,7 @@ VolumeGrid *BKE_volume_grid_get(const Volume *volume, int grid_index)
   return nullptr;
 #else
   UNUSED_VARS(volume, grid_index);
-  return NULL;
+  return nullptr;
 #endif
 }
 
@@ -1409,7 +1409,7 @@ VolumeGrid *BKE_volume_grid_add(Volume *volume, const char *name, VolumeGridType
   return &grids.back();
 #else
   UNUSED_VARS(volume, name, type);
-  return NULL;
+  return nullptr;
 #endif
 }
 

source/blender/blenkernel/intern/volume_render.cc

@@ -386,7 +386,7 @@ void BKE_volume_grid_wireframe(const Volume *volume,
 
 #else
   UNUSED_VARS(volume, volume_grid);
-  cb(cb_userdata, NULL, NULL, 0, 0);
+  cb(cb_userdata, nullptr, nullptr, 0, 0);
 #endif
 }
 
@@ -432,7 +432,7 @@ void BKE_volume_grid_selection_surface(const Volume *volume,
   cb(cb_userdata, (float(*)[3])verts.data(), (int(*)[3])tris.data(), verts.size(), tris.size());
 #else
   UNUSED_VARS(volume, volume_grid);
-  cb(cb_userdata, NULL, NULL, 0, 0);
+  cb(cb_userdata, nullptr, nullptr, 0, 0);
 #endif
 }
 

source/blender/imbuf/intern/openexr/openexr_stub.cpp

@@ -26,11 +26,11 @@
 
 void *IMB_exr_get_handle(void)
 {
-  return NULL;
+  return nullptr;
 }
 void *IMB_exr_get_handle_name(const char * /*name*/)
 {
-  return NULL;
+  return nullptr;
 }
 void IMB_exr_add_channel(void * /*handle*/,
                          const char * /*layname*/,
@@ -82,7 +82,7 @@ float *IMB_exr_channel_rect(void * /*handle*/,
                             const char * /*passname*/,
                             const char * /*view*/)
 {
-  return NULL;
+  return nullptr;
 }
 
 void IMB_exr_read_channels(void * /*handle*/)