ASoC: sound/ad73311: add missing __devexit marker

This fixes the following warning:

sound/soc/codecs/ad73311.c:50:12: warning: 'ad73311_remove' defined but not used

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/soc/codecs/ad73311.c b/sound/soc/codecs/ad73311.c
index c53955f..de799cd 100644
--- a/sound/soc/codecs/ad73311.c
+++ b/sound/soc/codecs/ad73311.c
@@ -47,7 +47,7 @@
 			&soc_codec_dev_ad73311, &ad73311_dai, 1);
 }
 
-static int ad73311_remove(struct platform_device *pdev)
+static int __devexit ad73311_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_codec(&pdev->dev);
 	return 0;