block: switch on bio operation in bio_integrity_prep

Use a single switch to perform read and write specific checks and exit
early for other operations instead of having two checks using different
predicates.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-5-hch@lst.de


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