PVS-Studio warning V510 for TortoiseSVN

class CTSVNPath
{
  ....
private:
  mutable CString m_sBackslashPath;
  mutable CString m_sLongBackslashPath;
  mutable CString m_sFwdslashPath;
  ....
};

const FileStatusCacheEntry * SVNFolderStatus::BuildCache(
  const CTSVNPath& filepath, ....)
{
  ....
  CTraceToOutputDebugString::Instance() (_T(__FUNCTION__)
    _T(": building cache for %s\n"), filepath);
  ....
}

This suspicious code was found in TortoiseSVN project by PVS-Studio static code analyzer.
Warning message is:
V510 The 'operator()' function is not expected to receive class-type variable as second actual argument. svnfolderstatus.cpp 150

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/