Fix compilie error

paddle/operators/listen_and_serv_op.cc

@@ -204,4 +204,4 @@ from send_op and send back variables to recv_op.
 namespace ops = paddle::operators;
 
 REGISTER_OPERATOR(listen_and_serv, ops::ListenAndServOp,
-                  ops::ListenAndServOpMaker);
\ No newline at end of file
+                  ops::ListenAndServOpMaker);

paddle/operators/send_op.cc

@@ -65,9 +65,9 @@ class SendOp : public framework::OperatorBase {
     if (outs.size() > 0) {
       for (size_t i = 0; i < outs.size(); i++) {
         VLOG(3) << "getting " << outs[i] << " from " << epmap[i];
-        client_.AsyncGetVariable(epmap[i], ctx, scope, outs[i]);
+        rpc_client->AsyncGetVariable(epmap[i], ctx, scope, outs[i]);
       }
-      PADDLE_ENFORCE(client_.Wait());
+      PADDLE_ENFORCE(rpc_client->Wait());
     }
   }
 };