[issue20440] Use the Py_SETREF macro

[Serhiy Storchaka]

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


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title: Use Py_REPLACE/Py_XREPLACE macros -> Use the Py_SETREF macro

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20440>
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