PVS-Studio warning V501 for Firefox

nsresult
SVGOrientSMILType::Interpolate(....)
{
  ...
  if (aStartVal.mU.mOrient.mOrientType !=
      nsIDOMSVGMarkerElement::SVG_MARKER_ORIENT_ANGLE ||
      aStartVal.mU.mOrient.mOrientType !=
      nsIDOMSVGMarkerElement::SVG_MARKER_ORIENT_ANGLE)
  {
    // TODO: it would be nice to be able
    // to handle auto angles too.
    return NS_ERROR_FAILURE;
  }
  ...
}

This suspicious code was found in Firefox project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions to the left and to the right of the '||' operator. svgorientsmiltype.cpp 161

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/