Merge "Fix Clang unused-but-set-variable warning" into main

    for (int i = 0; i < hBins * sBins; ++i) histOut[i] = 0.0f;

    int h, s, v;

    int h, s;

    float hScaler = hBins / 256.0f;

    float sScaler = sBins / 256.0f;

    for( ; numPixels > 0; --numPixels) {

      h = *(pixelIn++);

      s = *(pixelIn++);

      v = *(pixelIn++);

      pixelIn++;

      pixelIn++;

      int index = static_cast<int>(s * sScaler) * hBins + static_cast<int>(h * hScaler);