[issue18904] Unnecessary test in file descriptor inheritance test

[Roundup Robot]

Roundup Robot added the comment:

New changeset b13cec63b495 by Victor Stinner in branch 'default':
Issue #18904: Improve os.get/set_inheritable() tests
http://hg.python.org/cpython/rev/b13cec63b495

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nosy: +python-dev

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<http://bugs.python.org/issue18904>
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