avcodec/mlpdec: fix () in MSB_MASK() macro

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/mss34dsp: fix () in SOP* macros

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/mss4: Fix () in MKVAL() macro

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