hgwebdir_mod: fix a performance issue with static files

mercurial/hgweb/hgwebdir_mod.py

@@ -130,7 +130,7 b' class hgwebdir(object):'
                     else:
                         fname = req.form['static'][0]
                     static = templater.templatepath('static')
-                    return staticfile(static, fname, req)
+                    return (staticfile(static, fname, req),)
 
                 # top-level index
                 elif not virtual: