[issue36880] Returning None from a callback with restype py_object decrements None's refcount too much

[dgelessus]

Change by dgelessus <dgelessus+bugs.python.org at me.com>:


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keywords: +patch
pull_requests: +13273
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36880>
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