[issue22156] Fix compiler warnings

[Serhiy Storchaka]

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


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components: +Extension Modules, Interpreter Core
nosy: +serhiy.storchaka
stage:  -> patch review
type:  -> compile error

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22156>
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