Use av_restrict instead of restrict in libavcodec/opus_celt.c.
avcodec/utils: Fix undefined behavior in avpriv_toupper4

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/cavs: prevent out of array read

The used value should not matter as long as its within the array
as it is multiplied by 0

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