d2c8789e

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

warp/test: stop the accept loop the way a closed socket does

The test ended the accept loop with a userError, which warp reads as an
accept() that broke on its own. A real closed listening socket gives
EBADF, arriving as InvalidArgument, and that is the case the test means to
stand for.

It also matters for anything that changes how accept failures are handled.
With #1106, which rethrows accept errors other than the deliberate close, a
userError propagates out of runSettingsSocket and this test fails, making
the two branches unmergeable together for no reason beyond the test having
picked the wrong error.

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