remove socket from pool on destroy

Author: feross

lib/client/websocket-tracker.js

@@ -73,6 +73,8 @@ WebSocketTracker.prototype.destroy = function (onclose) {
   self.destroyed = true
   clearInterval(self.interval)
 
+  socketPool[self.announceUrl] = null
+
   self.socket.removeListener('data', self._onSocketDataBound)
   self.socket.removeListener('close', self._onSocketCloseBound)
   self.socket.removeListener('error', self._onSocketErrorBound)