[issue21038] test_epoll.TestEPoll.test_control_and_wait: remove extra assertion

[Roundup Robot]

Roundup Robot added the comment:

New changeset d09032a9adee by Victor Stinner in branch '2.7':
Issue #21038: Cleanup test_epoll.py
http://hg.python.org/cpython/rev/d09032a9adee

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<http://bugs.python.org/issue21038>
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