[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

"I created a first toy based on the PEP 445 to test of Python handles MemoryError: in short, Python handles them badly..."

Ooops: to test *how* Python handles..

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18408>
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