block: remove the disk argument from blk_drop_partitions

The gendisk can be trivially deducted from the block_device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 52b6f64..9c8de54 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1517,7 +1517,7 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
 	lockdep_assert_held(&bdev->bd_mutex);
 
 rescan:
-	ret = blk_drop_partitions(disk, bdev);
+	ret = blk_drop_partitions(bdev);
 	if (ret)
 		return ret;