[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 026593cbc006 by Victor Stinner in branch 'default':
Issue #18519, #18408: Fix sqlite authorizer callback
http://hg.python.org/cpython/rev/026593cbc006

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<http://bugs.python.org/issue18408>
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