Ref T105, remove empty cleanup functions

src/blackcore/vatsim/vatsimstatusfilereader.h

@@ -56,12 +56,6 @@ namespace BlackCore
             //! Data have been read
             void dataRead(BlackMisc::Network::CEntityFlags::Entity entity, BlackMisc::Network::CEntityFlags::ReadState state, int number);
 
-        protected:
-            //! \name BlackCore::CThreadedReader overrides
-            //! @{
-            virtual void cleanup() override;
-            //! @}
-
         private slots:
             //! Data have been read, parse VATSIM file
             void ps_parseVatsimFile(QNetworkReply *nwReply);