[issue1621] Do not assume signed integer overflow behavior

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The audioop part LGTM. If this case was found with the help of -ftrapv, I'm for adding this option in a debug build.

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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1621>
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