Don't session_destroy before creating a new liveuser, I don't have any...

Don't session_destroy before creating a new liveuser, I don't have any evidence that it does anything useful now.

htdocs/auth/lib.php

@@ -997,7 +997,6 @@ function login_submit(Pieform $form, $values) {
         try {
             // Reset the LiveUser object, since we are attempting to create a 
             // new user
-            session_destroy();
             $USER = new LiveUser();
 
             $authinstances = get_records_sql_array('