PVS-Studio warning V501 for VTK

template<class point_type>
void vtkProjectedTetrahedraMapperTransformPoints(....)
{
  ...
  if (   (mat[0*4+3] != 0) || (mat[1*4+3] != 0)
      || (mat[0*4+3] != 0) || (mat[1*4+3] != 1) )
  ...
}

This suspicious code was found in VTK project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions '(mat[0 * 4 + 3] != 0)' to the left and to the right of the '||' operator. vtkVolumeRendering vtkprojectedtetrahedramapper.cxx 134

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