avfilter/vf_noise: unbreak filter when inline assembly is not present

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avfilter/vf_noise: dont corrupt the picture outside width x height

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/aic: fix "warning: comparison of unsigned expression < 0 is always false"

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