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

2 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/editors/armature/pose_edit.c b/source/blender/editors/armature/pose_edit.c
index a929507929f..5015829f868 100644
--- a/source/blender/editors/armature/pose_edit.c
+++ b/source/blender/editors/armature/pose_edit.c
@@ -86,7 +86,7 @@ void ED_armature_enter_posemode(bContext *C, Base *base)
 	ReportList *reports = CTX_wm_reports(C);
 	Object *ob = base->object;
 	
-	if (ob->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(ob)) {
 		BKE_report(reports, RPT_WARNING, "Cannot pose libdata");
 		return;
 	}
diff --git a/source/blender/editors/armature/pose_lib.c b/source/blender/editors/armature/pose_lib.c
index dca9aa3e446..d9a3efa765c 100644
--- a/source/blender/editors/armature/pose_lib.c
+++ b/source/blender/editors/armature/pose_lib.c
@@ -183,7 +183,7 @@ static int has_poselib_pose_data_poll(bContext *C)
 static int has_poselib_pose_data_for_editing_poll(bContext *C)
 {
 	Object *ob = get_poselib_object(C);
-	return (ob && ob->poselib && !ob->poselib->id.lib);
+	return (ob && ob->poselib && !ID_IS_LINKED_DATABLOCK(ob->poselib));
 }
 
 /* ----------------------------------- */
@@ -385,7 +385,7 @@ static int poselib_add_poll(bContext *C)
 	if (ED_operator_posemode(C)) {
 		Object *ob = get_poselib_object(C);
 		if (ob) {
-			if ((ob->poselib == NULL) || (ob->poselib->id.lib == 0)) {
+			if ((ob->poselib == NULL) || !ID_IS_LINKED_DATABLOCK(ob->poselib)) {
 				return true;
 			}
 		}