fsnotify: remove a stray unlock

We recently shifted this code around, so we're no longer holding the
lock on this path.

Fixes: 755b5bc681eb ("fsnotify: Remove indirection from mark list addition")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/notify/mark.c

@@ -603,7 +603,6 @@ err:
 			 FSNOTIFY_MARK_FLAG_ATTACHED);
 	list_del_init(&mark->g_list);
 	atomic_dec(&group->num_marks);
-	spin_unlock(&mark->lock);
 
 	fsnotify_put_mark(mark);
 	return ret;