Fixing returning a copy

Unreal/CarlaUE4/Plugins/Carla/Source/Carla/Sensor/OpticalFlowCamera.cpp

@@ -40,7 +40,7 @@ void AOpticalFlowCamera::PostPhysTick(UWorld *World, ELevelTick TickType, float
       IntermediateBuffer.Add(y);
       ++Buf;
     }
-    return std::move(IntermediateBuffer);
+    return IntermediateBuffer;
   };
   FPixelReader::SendPixelsInRenderThread<AOpticalFlowCamera, float>(*this, true, Conversor);