net: small code cleanup

`options` is already a param of the function.

PR-URL: #3943
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: jscissr

lib/net.js

@@ -1077,7 +1077,6 @@ function Server(options, connectionListener) {
   EventEmitter.call(this);
 
   var self = this;
-  var options;
 
   if (typeof options === 'function') {
     connectionListener = options;