fanotify: drop the useless priority argument

The priority argument in fanotify is useless.  Kill it.

Signed-off-by: Eric Paris <eparis@redhat.com>

include/linux/fsnotify_backend.h

@@ -143,7 +143,6 @@ struct fsnotify_group {
 					 * a group */
 	struct list_head marks_list;	/* all inode marks for this group */
 
-	unsigned int priority;		/* order of this group compared to others */
 	/* prevents double list_del of group_list.  protected by global fsnotify_grp_mutex */
 	bool on_inode_group_list;
 	bool on_vfsmount_group_list;