Docs: PyModule_AddObjectRef should return -1 if value is NULL.

[c2170]

Documentation

If value is NULL, 'PyModule_AddObjectRef' should return -1, not NULL.

https://docs.python.org/3/c-api/module.html

Linked PRs

• gh-101944: Fix return value of PyModule_AddObjectRef documentation #101945
• gh-101944: mistake in documentation for PyModule_AddObjectRef() #101957
• gh-101944: Clarify PyModule_AddObjectRef() documentation #129433
• [3.13] gh-101944: Clarify PyModule_AddObjectRef() documentation (GH-129433) #129612
• [3.12] gh-101944: Clarify PyModule_AddObjectRef() documentation (GH-129433) #129613
• gh-101944: correct typo in the comment of PyModule_AddObjectRef #129659

[vstinner]

I created a doc change to clarify the NULL case: PR gh-129433.