imv-os: check_packages() fails if product query fails

src/libimcv/plugins/imv_os/imv_os_database.c

@@ -67,6 +67,7 @@ METHOD(imv_os_database_t, check_packages, status_t,
 				DB_TEXT, product, DB_INT);
 	if (!e)
 	{
+		return FAILED;
 	}
 	if (!e->enumerate(e, &pid))
 	{