loop: add missing bd_abort_claiming in loop_set_status

Commit 08e136e ("loop: don't change loop device under exclusive
opener in loop_set_status") forgot to call bd_abort_claiming() when
mutex_lock_killable() failed.

Fixes: 08e136e ("loop: don't change loop device under exclusive opener in loop_set_status")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Tetsuo Handa

drivers/block/loop.c

@@ -1245,7 +1245,8 @@ loop_set_status(struct loop_device *lo, blk_mode_t mode,
 
 	err = mutex_lock_killable(&lo->lo_mutex);
 	if (err)
-		return err;
+		goto out_abort_claiming;
+
 	if (lo->lo_state != Lo_bound) {
 		err = -ENXIO;
 		goto out_unlock;
@@ -1284,6 +1285,7 @@ loop_set_status(struct loop_device *lo, blk_mode_t mode,
 	}
 out_unlock:
 	mutex_unlock(&lo->lo_mutex);
+out_abort_claiming:
 	if (!(mode & BLK_OPEN_EXCL))
 		bd_abort_claiming(bdev, loop_set_status);
 out_reread_partitions: