block: use bdev_discard_alignment in part_discard_alignment_show
Use the bdev based alignment helper instead of open coding it. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20220415045258.199825-21-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>
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