chg: ignore already closed fds when cleaning up This should fix this error we see in the CI from time to time: ``` --- /tmp/mercurial-ci/tests/test-chg.t +++ /tmp/mercurial-ci/tests/test-chg.t.err @@ -187,6 +187,26 @@ $ chg bulkwrite --pager=on --color no --config ui.formatted=True paged! 'going to write massive data\n' killed! (?) + Traceback (most recent call last): + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/commandserver.py", line 509, in _serverequest + sv.cleanup() + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/chgserver.py", line 382, in cleanup + self._restoreio() + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/chgserver.py", line 461, in _restoreio + os.close(fd) + OSError: [Errno 9] Bad file descriptor + Traceback (most recent call last): + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/commandserver.py", line 693, in _acceptnewconnection + self._runworker(conn) + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/commandserver.py", line 744, in _runworker + prereposetups=[self._reposetup], + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/commandserver.py", line 509, in _serverequest + sv.cleanup() + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/chgserver.py", line 382, in cleanup + self._restoreio() + File "/tmp/hgtests._uvojvqb/install/lib/python/mercurial/chgserver.py", line 461, in _restoreio + os.close(fd) + OSError: [Errno 9] Bad file descriptor [255] ```