PVS-Studio warning V545 for QT

STDMETHODIMP QEnumPins::QueryInterface(const IID &iid,void **out)
{
  ...
  if (S_OK)
    AddRef();
  return hr;
}

It works on a sheer luck. S_OK is 0, by the way. That is, we don't perform AddRef().
This is what should have been written here: if (hr == S_OK).

This suspicious code was found in QT project by PVS-Studio static code analyzer.
Warning message is:
V545 Such conditional expression of 'if' operator is incorrect for the HRESULT type value '(HRESULT) 0L'. The SUCCEEDED or FAILED macro should be used instead. phonon_ds9 qbasefilter.cpp 60

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/