Also remove the code using size-0 OUTPUT buffer to flush.
Signed-off-by: NTiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: NWu-Cheng Li <wuchengli@chromium.org>
Reviewed-by: NKuang-che Wu <kcwu@chromium.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>