avfilter/af_alimiter: fix misbehavior when nb_channels != 2
Some code in alimiter assumes that there are 2 channels, resulting in
clipping if the loudest channel is 3 or above and an out-of-bounds read if
the input is monophonic. Fix that in 2 places.
Signed-off-by: David Flater <dave@flaterco.com>
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