on2avc: change a comment at #endif to match actual define
Merge commit '7cade8ea2bb19e78dae42b29720535a70fb2ae84'

* commit '7cade8ea2bb19e78dae42b29720535a70fb2ae84':
  on2avc: change a comment at #endif to match actual define

Merged-by: Michael Niedermayer <michaelni@gmx.at>
swresample: fix AV_CH_LAYOUT_STEREO_DOWNMIX input

Fixes Ticket 3542

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