Replace of (id->lib != NULL) check by meaningful macro.

Idea is to replace hard-to-track (id->lib != NULL) 'is linked datablock' check everywhere in Blender
by a macro doing the same thing. This will allow to easily spot those checks in future, and more importantly,
to easily change it (see work done in asset-engine branch).

Note: did not touch to readfile.c, since there most of the time 'id->lib' check actually concerns the pointer,
and not a check whether ID is linked or not. Will have a closer look at it later.

Reviewers: campbellbarton, brecht, sergey

Differential Revision: https://developer.blender.org/D2082

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/object/object_modifier.c b/source/blender/editors/object/object_modifier.c
index 264945b00bf..b44ddf925a8 100644
--- a/source/blender/editors/object/object_modifier.c
+++ b/source/blender/editors/object/object_modifier.c
@@ -817,9 +817,9 @@ int edit_modifier_poll_generic(bContext *C, StructRNA *rna_type, int obtype_flag
 	PointerRNA ptr = CTX_data_pointer_get_type(C, "modifier", rna_type);
 	Object *ob = (ptr.id.data) ? ptr.id.data : ED_object_active_context(C);
 	
-	if (!ob || ob->id.lib) return 0;
+	if (!ob || ID_IS_LINKED_DATABLOCK(ob)) return 0;
 	if (obtype_flag && ((1 << ob->type) & obtype_flag) == 0) return 0;
-	if (ptr.id.data && ((ID *)ptr.id.data)->lib) return 0;
+	if (ptr.id.data && ID_IS_LINKED_DATABLOCK(ptr.id.data)) return 0;
 	
 	return 1;
 }