PVS-Studio warning V571 for CryEngineSDK

inline typename CryStringT<T>::size_type
CryStringT<T>::rfind( value_type ch,size_type pos ) const
{
  const_str str;
  if (pos == npos) {
    ....
  } else {
    if (pos == npos)
      pos = length();
  ....
}

This suspicious code was found in CryEngineSDK project by PVS-Studio static code analyzer.
Warning message is:
V571 Recurring check. The 'if (pos == npos)' condition was already verified in line 1447. crystring.h 1453

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