Use Py_RETURN_NONE where suitable

Peter Eisentraut <peter_e@gmx.net>

Commit: 0008a106d4f84206a96fc1fb09a1e6b09f1627ec
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-09-29T20:51:39Z
Releases: 11.0
Use Py_RETURN_NONE where suitable

This is more idiomatic style and available as of Python 2.4, which is
our minimum.

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