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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3cd216b56599 by Victor Stinner in branch '3.4':
Issue #21038: Cleanup test_epoll.py
http://hg.python.org/cpython/rev/3cd216b56599

New changeset 945d7dd3b455 by Victor Stinner in branch '3.4':
Issue #21038: Use monotonic clock to compute timeout, not the system clock
http://hg.python.org/cpython/rev/945d7dd3b455

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nosy: +python-dev

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