avcodec/cdxl: use av_freep()

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avfilter/avf_avectorscope: improve description

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/mationpixels: free memory after malloc failures

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/bfi: check for malloc failure

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