avcodec/pngdec: fix () in OP_* macros

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/opus_celt: Fix () in CELT_PVQ_V macro

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/opus: Fix () in ROUND_MULL() macro

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/msvideo1enc: Fix () in MKRGB555() macro

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>