PVS-Studio warning V557 for IPP Samples

struct AVS_MB_INFO
{
  ...
  Ipp8u refIdx[AVS_DIRECTIONS][4];
  ...
};

void AVSCompressor::GetRefIndiciesBSlice(void){
  ...
  if (m_pMbInfo->predType[0] & predType)
  {
    m_refIdx[iRefNum] = m_pMbInfo->refIdx[dir][0];
    iRefNum += 1;
  }
  if (m_pMbInfo->predType[1] & predType)
  {
    m_refIdx[iRefNum] = m_pMbInfo->refIdx[dir][1];
    iRefNum += 1;
  }
  if (m_pMbInfo->predType[2] & predType)
  {
    m_refIdx[iRefNum] = m_pMbInfo->refIdx[dir][2];
    iRefNum += 1;
  }
  if (m_pMbInfo->predType[3] & predType)
  {
    m_refIdx[iRefNum] = m_pMbInfo->refIdx[dir][30];
    iRefNum += 1;
  }
  ...
}

The programmer's hand faltered and now we have 30 instead of 3.

This suspicious code was found in IPP Samples project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The '30' index is pointing beyond array bound. avs_enc umc_avs_enc_compressor_enc_b.cpp 495

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/