Anim: made object param of BKE_animdata_id_is_animated() const

No functional changes.

source/blender/blenkernel/BKE_animsys.h

@@ -61,7 +61,7 @@ bool BKE_animdata_set_action(struct ReportList *reports, struct ID *id, struct b
 void BKE_animdata_free(struct ID *id, const bool do_id_user);
 
 /* Return true if the ID-block has non-empty AnimData. */
-bool BKE_animdata_id_is_animated(struct ID *id);
+bool BKE_animdata_id_is_animated(const struct ID *id);
 
 /* Copy AnimData */
 struct AnimData *BKE_animdata_copy(struct Main *bmain, struct AnimData *adt, const int flag);

source/blender/blenkernel/intern/anim_sys.c

@@ -283,7 +283,7 @@ void BKE_animdata_free(ID *id, const bool do_id_user)
   }
 }
 
-bool BKE_animdata_id_is_animated(struct ID *id)
+bool BKE_animdata_id_is_animated(const struct ID *id)
 {
   if (id == NULL) {
     return false;