[issue28999] Use Py_RETURN_NONE and like

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Raymond. I didn't expect to get an approval from you and were ready to withdraw the patch. I myself were just +0 on pushing these changes.

Omitted changes in Modules/xx*.c and added few changes which Coccinelle missed.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<http://bugs.python.org/issue28999>
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