[issue25582] Fixed memory leaks in test_ctypes

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +amaury.forgeotdarc, belopolsky, meador.inge

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25582>
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