Fixed the refinery issue from pipeline

src/BuildingPlacer.cpp

@@ -233,7 +233,7 @@ CCTilePosition BuildingPlacer::getRefineryPosition()
 
     for (auto & unit : m_bot.GetAllUnits())
     {
-		UnitType & refinery = Util::GetRefinery(m_bot.GetPlayerRace(Players::Self), m_bot);
+		UnitType refinery = Util::GetRefinery(m_bot.GetPlayerRace(Players::Self), m_bot);
 
 
         if (!unit.getType().isGeyser())