Clean up SAO encoding.
Clean up SAO encoding.

- Fixes a bug when pic->slice_sao_chroma == false.

lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar