PVS-Studio warning V637 for TinyCAD

void CTinyCadView::OnDraw(CDC* pDC)
{
  ....
  // Is any of this region in the off-page area?
  if (!pDC->IsPrinting())
  {
    // Paint the region white
    if (pDC->IsPrinting())
    {
      dc.SelectBrush(cWHITE);
      dc.SelectPen(PS_SOLID, 1, cWHITE);
    }
  ....
}

This suspicious code was found in TinyCAD project by PVS-Studio static code analyzer.
Warning message is:
V637 Two opposite conditions were encountered. The second condition is always false. Check lines: 86, 90. paint.cpp 86

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/