[issue39824] Multi-phase extension module (PEP 489): don't call m_traverse, m_clear nor m_free before the module state is allocated

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Proposed PR checking if the module state is NULL:

* PR 18358: _locale module
* PR 18608: audioop module
* PR 18613: binascii

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