PVS-Studio warning V501 for QT

QString DayTimeDuration::stringValue() const
{
  ....
  if(!m_hours && !m_minutes && !m_seconds && !m_seconds)
  ....
}

This is what should have been written here: if(!m_hours && !m_minutes && !m_seconds && !m_mseconds)


This suspicious code was found in QT project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions '!m_seconds' to the left and to the right of the '&&' operator. qdaytimeduration.cpp 148

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/