[issue20437] Use Py_CLEAR to safe clear attributes

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thanks Larry and Antoine for your reviews.

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assignee:  -> serhiy.storchaka
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20437>
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