PVS-Studio warning V567 for IPP Samples

bool MoveOnNextFrame()
{
  if (m_nFrames>0)
  {
    m_pFrame[m_curIndex] = 0;
    m_curIndex = (++m_curIndex)%m_maxN;
    m_nFrames--;
    return true;
  }
  return false;
}

This suspicious code was found in IPP Samples project by PVS-Studio static code analyzer.
Warning message is:
V567 Undefined behavior. The 'm_curIndex' variable is modified while being used twice between sequence points. vc1_enc umc_vc1_enc_planes.h 630

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