fix socket "error" handling

always has clientError now

docs/api.md

@@ -38,6 +38,7 @@ http.createServer(app.callback()).listen(3001);
   Application settings are properties on the `app` instance, currently
   the following are supported:
 
+  - `app.name` optionally give your application a name
   - `app.env` defaulting to the __NODE_ENV__ or "development"
   - `app.proxy` when true proxy header fields will be trusted
   - `app.subdomainOffset` offset of `.subdomains` to ignore [2]

lib/application.js

@@ -129,7 +129,7 @@ app.callback = function(){
   return function(req, res){
     var ctx = new self.Context(self, req, res);
 
-    if (!ctx.socket.listeners('error').length) {
+    if (1 == ctx.socket.listeners('error').length) {
       ctx.socket.on('error', function(err){
         self.emit('error', err);
       });