IB/rxe: Fix resid update

Update the response's resid field when larger than MTU, instead of only
updating the local resid variable.

Fixes: 8700e3e7 ("Soft RoCE driver")
Signed-off-by: NEyal Itkin <eyal.itkin@gmail.com>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -479,7 +479,7 @@ static enum resp_states check_rkey(struct rxe_qp *qp,
 				goto err2;
 			}
 
-			resid = mtu;
+			qp->resp.resid = mtu;
 		} else {
 			if (pktlen != resid) {
 				state = RESPST_ERR_LENGTH;