[issue1621] Do not assume signed integer overflow behavior

[Roundup Robot]

Roundup Robot added the comment:

New changeset d6a86018ab33 by Martin Panter in branch 'default':
Issue #1621: Avoid signed int negation overflow in audioop
https://hg.python.org/cpython/rev/d6a86018ab33

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