opus - Aug 2017 - [pull request] Fix a typo in a comment in opus_decoder.c

This fixes a tiny copy/paste error in a comment, which confused me for a
moment when first reading the code:

https://github.com/xiph/opus/pull/60
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.xiph.org/pipermail/opus/attachments/20170824/efa597ed/attachment-0001.html>