block: refactor to use helper

[ Upstream commit 8f63fef5 ]

Reduce some code by making use of bio_integrity_bytes().

Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20230719121608.32105-1-nj.shetty@samsung.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: 899ee2c3 ("block: initialize integrity buffer to zero before writing it to media")
Signed-off-by: Sasha Levin <sashal@kernel.org>