PVS-Studio warning V501 for VTK

void vtkDiscretizableColorTransferFunction::Build()
{
  ...
  if (this->Discretize &&
      (this->GetMTime() > this->BuildTime ||
       this->GetMTime() > this->BuildTime))
  ...
}

This suspicious code was found in VTK project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions 'this->GetMTime() > this->BuildTime' to the left and to the right of the '||' operator. vtkFiltering vtkdiscretizablecolortransferfunction.cxx 85

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