[issue22206] PyThread_create_key(): fix comparison between signed and unsigned numbers in Python/thread_pthread.h

[Serhiy Storchaka]

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


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nosy: +pitrou
stage:  -> patch review
type:  -> behavior
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22206>
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