PVS-Studio warning V547 for Firefox

bool
Adts::ConvertEsdsToAdts(uint16_t aChannelCount, ....)
{
  ....
  if (newSize >= (1 << 13) || aChannelCount < 0 ||
      aChannelCount > 15 || aFrequencyIndex < 0 ||
      aProfile < 1 || aProfile > 4)
    return false;
  ....
}

This suspicious code was found in Firefox project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression 'aChannelCount < 0' is always false. Unsigned type value is never < 0. adts.cpp 44

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