#82859 by RobRoy. Fix an uninitialized variable.

modules/user/user.module

@@ -2407,6 +2407,7 @@ function user_build_filter_query() {
     // This checks to see if this permission filter is an enabled permission for the authenticated role.
     // If so, then all users would be listed, and we can skip adding it to the filter query.
     if ($key == 'permission') {
+      $account = new StdClass();
       $account->uid = 'user_filter';
       $account->roles = array(DRUPAL_AUTHENTICATED_RID => 1);
       if (user_access($value, $account)) {