Issue #1469758 by chertzog: Fix typo in sample hook_node_grants_alter function

core/modules/node/node.api.php

@@ -383,7 +383,7 @@ function hook_node_grants_alter(&$grants, $account, $op) {
   if ($op != 'view' && !empty($restricted)) {
     // Now check the roles for this account against the restrictions.
     foreach ($restricted as $role_id) {
-      if (isset($user->roles[$role_id])) {
+      if (isset($account->roles[$role_id])) {
         $grants = array();
       }
     }