fix the cpp server example

examples/server.cpp

@@ -40,10 +40,9 @@ int main()
     UA_QualifiedName myIntegerName = UA_QUALIFIEDNAME(1, "the answer");
     UA_NodeId parentNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
     UA_NodeId parentReferenceNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
-    UA_AddNodesResult res = UA_Server_addVariableNode(server, myIntegerNodeId, parentNodeId,
-                                                      parentReferenceNodeId, myIntegerName,
-                                                      UA_NODEID_NULL, attr);
-    UA_AddNodesResult_deleteMembers(&res);
+    UA_Server_addVariableNode(server, myIntegerNodeId, parentNodeId,
+                              parentReferenceNodeId, myIntegerName,
+                              UA_NODEID_NULL, attr, NULL);
 
     UA_Boolean running = UA_TRUE;
     UA_StatusCode retval = UA_Server_run(server, 1, &running);