block: simplify block device syncing in bdev_del_partition

We just checked a little above that the block device for the partition
im busy.  That implies no file system is mounted, and thus the only
thing in fsync_bdev that actually is used is sync_blockdev.  Just call
sync_blockdev directly.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/partitions/core.c

@@ -531,7 +531,7 @@ int bdev_del_partition(struct block_device *bdev, int partno)
 	if (bdevp->bd_openers)
 		goto out_unlock;
 
-	fsync_bdev(bdevp);
+	sync_blockdev(bdevp);
 	invalidate_bdev(bdevp);
 
 	mutex_lock_nested(&bdev->bd_mutex, 1);