doc/filters: amix only supports float samples

Signed-off-by: Lou Logan <lou@lrcd.com>
avcodec/cavs: use av_mallocz_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/vp3: use av_mallocz_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/rtspdec: Use av_mallocz_array()

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