PVS-Studio warning V593 for vscap

int EditStreamPadSilence(PAVISTREAM pavi, LONG * plPos,
                         LONG * plLength)
{
  ...
  if (hr = AVIFileGetStream(pfileSilence, &paviSilence,
                        streamtypeAUDIO , 0) != AVIERR_OK)
  {
    ErrMsg("Unable to load silence stream");
    return hr;
  }
  ...
}

This suspicious code was found in vscap project by PVS-Studio static code analyzer.
Warning message is:
V593 Consider reviewing the expression of the 'A = B != C' kind. The expression is calculated as following: 'A = (B != C)'. playplus playplusview.cpp 3620

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