net_uv: Don't add listenerCallback when null

lib/net_uv.js

@@ -359,20 +359,19 @@ function Server(/* [ options, ] listener */) {
 
   var self = this;
 
-  var options, listenerCallback;
+  var options;
 
   if (typeof arguments[0] == 'function') {
     options = {};
-    listenerCallback = arguments[0];
+    self.on('connection', arguments[0]);
   } else {
     options = arguments[0];
     
     if (typeof arguments[1] == 'function') {
-      listenerCallback = arguments[1];
+      self.on('connection', arguments[1]);
     }
   }
 
-  this.on('connection', listenerCallback);
   this.connections = 0;
   this.allowHalfOpen = options.allowHalfOpen || false;