log: Recent log list race

This looks racy:

Event: {'account': None, 'responses': [], 'source': u'atrum', 'state': u'offline', 'session': <sqlalchemy.orm.session.Session object at 0x4fa9090>, 'processed': False, 'time': datetime.datetime(2010, 10, 6, 11, 1, 27, 667092), 'identity': 14, 'message': u'Ping timeout', 'type': u'state', 'public': True, 'channel': None, 'sender': {'nick': u'Hodgestar', 'connection': u'Hodgestar', 'id': u'Hodgestar'}}
Traceback (most recent call last):
  File "/home/stefanor/bzr/ibid/stefanor/tibid/ibid/core.py", line 29, in process
    processor.process(event)
  File "/home/stefanor/bzr/ibid/stefanor/tibid/ibid/plugins/__init__.py", line 137, in process
    method(event)
  File "/home/stefanor/bzr/ibid/stefanor/tibid/ibid/plugins/log.py", line 176, in log_handler
    self.log_event(event)
  File "/home/stefanor/bzr/ibid/stefanor/tibid/ibid/plugins/log.py", line 169, in log_event
    file = self.get_logfile(event)
  File "/home/stefanor/bzr/ibid/stefanor/tibid/ibid/plugins/log.py", line 124, in get_logfile
    self.recent_logs.remove(log)
ValueError: list.remove(x): x not in list