librdmacm: Do not wait in rdma_accept for UD QPs

There are no additional connection events to process for UD QPs
after calling rdma_accept().  When using synchronous rdma_cm_id's,
simply return to the user after sending the reply.  Do not wait
for additional events.

This fixes a hang on the server side when setting up UD QP
communication.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>

src/cma.c

@@ -1502,6 +1502,9 @@ int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
 		return (ret >= 0) ? ERR(ENODATA) : -1;
 	}
 
+	if (ucma_is_ud_qp(id->qp_type))
+		return 0;
+
 	return ucma_complete(id_priv);
 }