block: return unsigned int from bdev_io_opt

The underlying limit is defined as an unsigned int, so return that from
bdev_io_opt as well.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: John Garry <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Christoph Hellwig

include/linux/blkdev.h

@@ -1275,7 +1275,7 @@ static inline unsigned int queue_io_opt(const struct request_queue *q)
 	return q->limits.io_opt;
 }
 
-static inline int bdev_io_opt(struct block_device *bdev)
+static inline unsigned int bdev_io_opt(struct block_device *bdev)
 {
 	return queue_io_opt(bdev_get_queue(bdev));
 }