[issue18520] Fixes bugs found by pyfailmalloc during Python initialization

[STINNER Victor]

STINNER Victor added the comment:

PyStructSequence_InitTypeWithError() return type is void, whereas it can fail and raise an exception. Can I change the return type, or should I create a new function?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18520>
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