[ALSA] soc - neo1973_wm8753 - Fix module unload

Signed-off-by: NTim Niemeyer <reddog@mastersword.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/soc/s3c24xx/neo1973_wm8753.c

@@ -659,6 +659,7 @@ static int __init neo1973_init(void)
 
 static void __exit neo1973_exit(void)
 {
+	i2c_del_driver(&lm4857_i2c_driver);
 	platform_device_unregister(neo1973_snd_device);
 }