block: remove the LBA alignment check in __blkdev_issue_zeroout

__blkdev_issue_zeroout is a purely kernel internal API and thus can rely
on the block layer sector alignment checks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-7-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>