fixed sole bug in Jorge's example

lib/walk-jorge.js

@@ -30,7 +30,8 @@ function walk (file, cb) {
   
   function getDirectory (cb) {
     fs.readdir(file, function(err, files) {
-      if (!files) return;
+      // XXX bug was here. `next()` added by coolaj86
+      if (!files) return next();
       //if (err) throw Error(err);
       files.sort(sort);
       files.forEach(fullPath);