PVS-Studio warning V595 for SlimDX

array<SoundEffectResult>^ SecondarySoundBuffer::SetEffects(
  array<Guid>^ effects )
{
  DWORD count = effects->Length;
  ....
  if( effects != nullptr && count > 0 )
  ....
}

This suspicious code was found in SlimDX project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'effects' pointer was utilized before it was verified against nullptr. Check lines: 66, 73. secondarysoundbuffer.cpp 66

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