Cleanup: use plural names for Main lists

Convention was not to but after discussion on 918941483f7e we agree its
best to change the convention.

Names now mostly follow RNA.

Some exceptions:

- Use 'nodetrees' instead of 'nodegroups'
  since the struct is called NodeTree.
- Use 'gpencils' instead of 'grease_pencil'
  since 'gpencil' is a common abbreviation in the C code.

Other exceptions:

- Leave 'wm' as it's a list of one.
- Leave 'ipo' as is for versioning.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/gpu/intern/gpu_material.c b/source/blender/gpu/intern/gpu_material.c
index ac5cd93d77e..302b3b4ef1c 100644
--- a/source/blender/gpu/intern/gpu_material.c
+++ b/source/blender/gpu/intern/gpu_material.c
@@ -754,10 +754,10 @@ void GPU_materials_free(Main *bmain)
 	World *wo;
 	extern Material defmaterial;
 
-	for (ma = bmain->mat.first; ma; ma = ma->id.next)
+	for (ma = bmain->materials.first; ma; ma = ma->id.next)
 		GPU_material_free(&ma->gpumaterial);
 
-	for (wo = bmain->world.first; wo; wo = wo->id.next)
+	for (wo = bmain->worlds.first; wo; wo = wo->id.next)
 		GPU_material_free(&wo->gpumaterial);
 
 	GPU_material_free(&defmaterial.gpumaterial);