hooks: Call the callback when done

If a hook function neither calls the callback nor returns a
(non-undefined) value then there's no way for the hook system to know
if/when the hook function has finished.

src/node/hooks/express/webaccess.js

@@ -198,4 +198,5 @@ exports.checkAccess = (req, res, next) => {
 
 exports.expressConfigure = (hook_name, args, cb) => {
   args.app.use(exports.checkAccess);
+  return cb();
 };