drm/xe: Reinit msg link when processing a message

Will help to avoid adding a static message twice.
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240809191929.3138956-3-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_gpu_scheduler.c

@@ -31,7 +31,7 @@ xe_sched_get_msg(struct xe_gpu_scheduler *sched)
 	msg = list_first_entry_or_null(&sched->msgs,
 				       struct xe_sched_msg, link);
 	if (msg)
-		list_del(&msg->link);
+		list_del_init(&msg->link);
 	xe_sched_msg_unlock(sched);
 
 	return msg;