fix memory leak

liuxiaolong

2021-07-20 232227035c8d6a31eaaf193863cbadda949c08fd

 box/center.cpp

@@ -146,7 +146,7 @@
            replyer(reply);
            auto hosts = center->FindRemoteSubClients(pub.topic());
            for (auto &host : hosts) {
               tcp_proxy.Publish(host, kBHCenterPort, pub.SerializeAsString());
               tcp_proxy.Publish(host, kBHCenterPort, msg.content());
            }
         }
      };