[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

"""
python: Python/ceval.c:1210: PyEval_EvalFrameEx: Assertion `!PyErr_Occurred()' failed.
Fatal Python error: Aborted

Current thread 0x404df8c0:
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/sqlite3/test/userfunctions.py", line 441 in authorizer_cb
"""

Ned Deily created the issue #18519 for that. It should be fixed by the changeset 026593cbc006.

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