PVS-Studio warning V510 for WinMerge

static void StoreDiffData(DIFFITEM &di, CDiffContext * pCtxt,
  const FolderCmp * pCmpData)
{
  ...
  GetLog()->Write
  (
    CLogFile::LCOMPAREDATA,
    _T("name=<%s>, leftdir=<%s>, rightdir=<%s>, code=%d"),
    di.left.filename.c_str(),
    di.left.path.c_str(),
    di.right.path.c_str(),
    di.diffcode
  );
  pCtxt->m_pCompareStats->AddItem(di.diffcode.diffcode);
  ...
}

'di.diffcode' is class object. Most likely this is what should be written here: di.diffcode.diffcode.

This suspicious code was found in WinMerge project by PVS-Studio static code analyzer.
Warning message is:
V510 The 'Write' function is not expected to receive class-type variable as sixth actual argument. Merge dirscan.cpp 565

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/