Fix a bug when packets are received on a channel after it closes.

Reported by cbowns.

ssnet.py

@@ -350,7 +350,11 @@ class Mux(Handler):
             else:
                 raise Exception('got CMD_HOST_LIST without got_host_list?')
         else:
-            callback = self.channels[channel]
+            callback = self.channels.get(channel)
+            if not callback:
+                log('warning: closed channel %d got cmd=%s len=%d\n' 
+                       % (channel, cmd_to_name.get(cmd,hex(cmd)), len(data)))
+            else:
                 callback(cmd, data)
 
     def flush(self):