bfi: check return value of av_malloc()

Signed-off-by: Paul B Mahol <onemda@gmail.com>
idcin: check return value of av_malloc()

Signed-off-by: Paul B Mahol <onemda@gmail.com>
westwood_vqa: check return value of av_malloc()

Signed-off-by: Paul B Mahol <onemda@gmail.com>