block: use the right type for stub rq_integrity_vec()

For !CONFIG_BLK_DEV_INTEGRITY, rq_integrity_vec() wasn't updated
properly. Fix it up.

Fixes: cf546dd289e0 ("block: change rq_integrity_vec to respect the iterator")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed