fix Scrutinizer annotations

inc/Ui/Recent.php

@@ -271,7 +271,6 @@ class Recent extends Ui
             {
                 global $lang;
                 $id = $this->info['id'];
-                $diff = false;
 
                 if (isset($this->info['media'])) {
                     $revs = (new MediaChangeLog($id))->getRevisions(0, 1);

lib/plugins/authad/action.php

@@ -69,7 +69,6 @@ class action_plugin_authad extends DokuWiki_Action_Plugin
         if ($pos === false) return;
 
         // any default?
-        $dom = '';
         if ($INPUT->has('u')) {
             $usr = $auth->cleanUser($INPUT->str('u'));
             $dom = $auth->getUserDomain($usr);