[issue30769] [EASY (C)] test_execve_invalid_env() of test_os leaks references

[Serhiy Storchaka]

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


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stage: commit review -> backport needed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30769>
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