RDMA/rxe: Remove unnecessary mr testing

Before the testing, we already passed it to rxe_mr_copy() where mr could
be dereferenced. so this checking is not needed.

The only way that mr is NULL is when it reaches below line 780 with
 'qp->resp.mr = NULL', which is not possible in Bob's explanation[1].

 778         if (res->state == rdatm_res_state_new) {
 779                 if (!res->replay) {
 780                         mr = qp->resp.mr;
 781                         qp->resp.mr = NULL;
 782                 } else {

[1] https://lore.kernel.org/lkml/[email protected]/

Link: https://lore.kernel.org/r/[email protected]
CC: Bob Pearson <[email protected]>
Signed-off-by: Li Zhijian <[email protected]>
Reviewed-by: Bob Pearson <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: zhijianli88

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -811,8 +811,7 @@ static enum resp_states read_reply(struct rxe_qp *qp,
 
 	err = rxe_mr_copy(mr, res->read.va, payload_addr(&ack_pkt),
 			  payload, RXE_FROM_MR_OBJ);
-	if (mr)
-		rxe_put(mr);
+	rxe_put(mr);
 	if (err) {
 		kfree_skb(skb);
 		return RESPST_ERR_RKEY_VIOLATION;