[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

"""
http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.0%203.x/builds/98/steps/test/logs/stdio

FAIL: test_finalize_runnning_thread (test.test_threading.ThreadTests)
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Traceback (most recent call last):
  File "/usr/home/buildbot/koobs-freebsd10/3.x.koobs-freebsd10/build/Lib/test/test_threading.py", line 298, in test_finalize_runnning_thread
    self.assertEqual(rc, 42)
AssertionError: -6 != 42
"""

Oh, this error is not a regression introduced by this issue: it was already present in the oldest build of this buildbot:
http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.0%203.x/builds/5/steps/test/logs/stdio

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