Remove a false assert: timeout can be None.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1922 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/event.py

@@ -99,7 +99,6 @@ class EpollEventManager(object):
                     self._addPendingConnection(to_process)
 
     def _poll(self, timeout = 1):
-        assert timeout >= 0
         rlist, wlist, elist = self.epoll.poll(timeout)
         r_done_set = set()
         for fd in rlist: