PVS-Studio warning V501 for Source SDK

static void DrawPyroVignette(....)
{
  ....
  Vector2D vMaxSize(
   ( float )nScreenWidth / ( float )nScreenWidth /
     NUM_PYRO_SEGMENTS * 2.0f,
   ( float )nScreenHeight / ( float )nScreenHeight /
     NUM_PYRO_SEGMENTS * 2.0f );
  ....
}

This suspicious code was found in Source SDK project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions '(float) nScreenWidth' to the left and to the right of the '/' operator. Client (HL2) viewpostprocess.cpp 1888

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