ASoC: Clean up the CODEC device as well as the board for SMDK WM9713

Otherwise we try to re-register the CODEC device if the module is reloaded
and sysfs becomes miserable.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/s3c24xx/smdk_wm9713.c

@@ -95,6 +95,7 @@ static int __init smdk_init(void)
 static void __exit smdk_exit(void)
 {
 	platform_device_unregister(smdk_snd_ac97_device);
+	platform_device_unregister(smdk_snd_wm9713_device);
 }
 
 module_init(smdk_init);