avfilter/video: remove commented out cruft

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/proresdec2: remove duplicated tables

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/g2meet: remove redundant log message

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/mjpegdec: check for malloc failure of blocks[] and last_nnz[]

Fixes null pointer dereference
Fixes Ticket2947

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