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, 1 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_meta.c b/source/blender/makesrna/intern/rna_meta.c
index 246a9c4beb5..0f4cd4759bc 100644
--- a/source/blender/makesrna/intern/rna_meta.c
+++ b/source/blender/makesrna/intern/rna_meta.c
@@ -95,7 +95,7 @@ static void rna_MetaBall_update_data(Main *bmain, Scene *scene, PointerRNA *ptr)
 
 	/* cheating way for importers to avoid slow updates */
 	if (mb->id.us > 0) {
-		for (ob = bmain->object.first; ob; ob = ob->id.next)
+		for (ob = bmain->objects.first; ob; ob = ob->id.next)
 			if (ob->data == mb)
 				BKE_mball_properties_copy(scene, ob);