Fix lock guard

source/RobotAPI/libraries/RobotUnitDataStreamingReceiver/RobotUnitDataStreamingReceiver.cpp

@@ -43,7 +43,7 @@ namespace armarx::detail::RobotUnitDataStreamingReceiver
 
         void update(const RobotUnitDataStreaming::TimeStepSeq& data, const Ice::Current&) override
         {
-            std::lock_guard{_data_mutex};
+            std::lock_guard g{_data_mutex};
             ARMARX_INFO << deactivateSpam()
                         << "received " << data.size() << " timesteps";
             _data.emplace_back(data);
@@ -98,7 +98,7 @@ namespace armarx
         ARMARX_CHECK_NOT_NULL(_receiver);
         std::deque<RobotUnitDataStreaming::TimeStepSeq> data;
         {
-            std::lock_guard{_receiver->_data_mutex};
+            std::lock_guard g{_receiver->_data_mutex};
             std::swap(data, _receiver->_data);
         }
         for (auto& chunk : data)