[issue22163] max_wbits set incorrectly to -zlib.MAX_WBITS in tarfile, shouldn't be negative

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +nadeem.vawda

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22163>
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