avformat/cinedec: fix sizeof()

Fixes CID1197047
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/mov: Fix width/height typo

Fixes CID1197050
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/cinedec: remove redundant zero termination

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