Parameter 2 to multistep_form_alter() expected to be a reference ... PHP 5.3

Hi,

This message appears on a PHP 5.3 server. It's a known issue in many other modules.

I removed all the ampersands in the relevant functions, but don't know if it's the way to go :

function multistep_form_alter(&$form, &$form_state, $form_id) {

to

function multistep_form_alter(&$form, $form_state, $form_id) {

No time to make a patch know but it clears the warnings. Please confirm if the module should behave correctly with this corrections.