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, 1 insertions, 1 deletions

diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index 707c60f8701..fc32613c1ab 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -6429,7 +6429,7 @@ static void createTransObject(bContext *C, TransInfo *t)
 		}
 		
 		/* select linked objects, but skip them later */
-		if (ob->id.lib != NULL) {
+		if (ID_IS_LINKED_DATABLOCK(ob)) {
 			td->flag |= TD_SKIP;
 		}