PVS-Studio warning V607 for TortoiseSVN

BOOL InitInstance(HINSTANCE hResource, int nCmdShow)
{
  ....
  app.hwndTT; // handle to the ToolTip control
  ....
}

This suspicious code was found in TortoiseSVN project by PVS-Studio static code analyzer.
Warning message is:
V607 Ownerless expression 'app.hwndTT'. tortoiseblame.cpp 1782

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