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/editors/space_nla/nla_edit.c b/source/blender/editors/space_nla/nla_edit.c
index 739a180d1d8..a92a2ec66ca 100644
--- a/source/blender/editors/space_nla/nla_edit.c
+++ b/source/blender/editors/space_nla/nla_edit.c
@@ -602,7 +602,7 @@ static int nlaedit_add_actionclip_exec(bContext *C, wmOperator *op)
 	cfra = (float)CFRA;
 
 	/* get action to use */
-	act = BLI_findlink(&CTX_data_main(C)->action, RNA_enum_get(op->ptr, "action"));
+	act = BLI_findlink(&CTX_data_main(C)->actions, RNA_enum_get(op->ptr, "action"));
 
 	if (act == NULL) {
 		BKE_report(op->reports, RPT_ERROR, "No valid action to add");