[opus] Int overflow fix not present in tree.

[Yves Gerey]

Hi! I'm Yves, bit fiddler, hoping to roll a fresh version of libopus into
chromium.

This fix
<https://chromium-review.googlesource.com/c/chromium/src/+/1072869/> never
made it to opus repository.

Was it intentional? If so, what is the rational?
If not, could the fix be applied on the libopus master branch?

Thanks for the amazing work!

-- 
Warm regards,
Yves
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