one more 'listening' race condition

test/simple/test-http-upgrade-client.js

@@ -26,9 +26,11 @@ var srv = net.createServer(function(c) {
         c.end();
     });
 });
-srv.listen(common.PORT, '127.0.0.1');
 
 var gotUpgrade = false;
+
+srv.listen(common.PORT, '127.0.0.1', function () {
+
   var hc = http.createClient(common.PORT, '127.0.0.1');
   hc.addListener('upgrade', function(res, socket, upgradeHead) {
       // XXX: This test isn't fantastic, as it assumes that the entire response
@@ -48,6 +50,7 @@ hc.addListener('upgrade', function(res, socket, upgradeHead) {
       gotUpgrade = true;
   });
   hc.request('GET', '/').end();
+});
 
 process.addListener('exit', function() {
     assert.ok(gotUpgrade);