PVS-Studio warning V614 for OGDF

bool OgmlParser::buildAttributedClusterGraph(....)
{
  ....
  XmlTagObject* layout;
  if (structure->m_pBrother != NULL) {
    layout = structure->m_pBrother;
  }
  if ((layout) &&
      (layout->getName() == Ogml::s_tagNames[Ogml::t_layout]))
  ....
}

This suspicious code was found in OGDF project by PVS-Studio static code analyzer.
Warning message is:
V614 Potentially uninitialized pointer 'layout' used. ogdf ogmlparser.cpp 2337

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