dm-integrity: use bio_add_virt_nofail

Convert the __bio_add_page(..., virt_to_page(), ...) pattern to the
bio_add_virt_nofail helper implementing it, and do the same for the
similar pattern using bio_add_page for adding the first segment after
a bio allocation as that can't fail either.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20250507120451.4000627-15-hch@lst.de


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