fix ref to connection

Author: sidorares

lib/connection.js

@@ -114,7 +114,7 @@ function Connection (opts)
 util.inherits(Connection, EventEmitter);
 
 Connection.prototype._handleNetworkError = function(err) {
-  var connection;
+  var connection = this;
   err.fatal = true;
   // stop receiving packets
   connection.stream.removeAllListeners('data');