ublk: remove ubq check in ublk_check_and_get_req()

ublk_get_queue() never returns a NULL pointer, so there's no need to
check its return value in ublk_check_and_get_req(). Drop the check.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: calebsander

drivers/block/ublk_drv.c

@@ -2495,9 +2495,6 @@ static struct request *ublk_check_and_get_req(struct kiocb *iocb,
 		return ERR_PTR(-EINVAL);
 
 	ubq = ublk_get_queue(ub, q_id);
-	if (!ubq)
-		return ERR_PTR(-EINVAL);
-
 	if (!ublk_support_user_copy(ubq))
 		return ERR_PTR(-EACCES);