drm/xe: Fix guc_exec_queue_set_priority

We need to set q->priority prior to calling guc_exec_queue_add_msg() as
that will call init_policies() and sets the scheduling properties to those
stored in the exec_queue.

Fixes: dd08ebf6 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Brian Welty <brian.welty@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
(cherry picked from commit b16483f9)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

drivers/gpu/drm/xe/xe_guc_submit.c

@@ -1308,8 +1308,8 @@ static int guc_exec_queue_set_priority(struct xe_exec_queue *q,
 	if (!msg)
 		return -ENOMEM;
 
-	guc_exec_queue_add_msg(q, msg, SET_SCHED_PROPS);
 	q->priority = priority;
+	guc_exec_queue_add_msg(q, msg, SET_SCHED_PROPS);
 
 	return 0;
 }