prov/rxm: Fix data error with FI_OFI_RXM_USE_RNDV_WRITE=1

Data varification would fail with rxm/verbs when FI_OFI_RXM_USE_RNDV_WRITE
is set to 1. It appears that the content of the receive buffer remains
unchanged after the rendezvous send is completed.

This only happens when the core provider requires FI_MR_LOCAL mode. The
root cause is that MR desciptors passed through the receive call are not
tranlated to rkeys when generating the rendzevous response. As a result,
the sender always writes 0 byte.

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>

prov/rxm/src/rxm_cq.c

@@ -613,6 +613,7 @@ static ssize_t rxm_handle_rndv(struct rxm_rx_buf *rx_buf)
 			mr = rx_buf->recv_entry->rxm_iov.desc[i];
 			rx_buf->recv_entry->rxm_iov.desc[i] =
 				fi_mr_desc(mr->msg_mr);
+			rx_buf->mr[i] = mr->msg_mr;
 		}
 	}