Fixed test_register_LSelectorI_error to make it work with OpenJdk

The test expected a NPE to be thrown when attempting to register
a previously closed selector. The OpenJdk implementation throws
a much more meaningful ClosedSelectorException. This fixes the
test to check for that exception.

Bug: 26141155
Change-Id: I5c18a3923c81f1e4ddacf1aac73cbd9b860bc7dc
1 file changed