dmi-id: fix a memory leak in dmi_id_init error path

This patch adds a missing kfree(dmi_dev) in dmi_id_init error path.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/firmware/dmi-id.c

@@ -229,10 +229,12 @@ static int __init dmi_id_init(void)
 
 	ret = device_register(dmi_dev);
 	if (ret)
-		goto fail_class_unregister;
+		goto fail_free_dmi_dev;
 
 	return 0;
 
+fail_free_dmi_dev:
+	kfree(dmi_dev);
 fail_class_unregister:
 
 	class_unregister(&dmi_class);