PVS-Studio warning V519 for QT

void QXmlStreamReaderPrivate::init()
{
  tos = 0;                   <<<---
  scanDtd = false;
  token = -1;
  token_char = 0;
  isEmptyElement = false;
  isWhitespace = true;
  isCDATA = false;
  standalone = false;
  tos = 0;                   <<<---
  ...
}

This suspicious code was found in QT project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'tos' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 811, 819. bootstrap qxmlstream.cpp 819

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/