ASoC: sound/max98088: add missing __devexit marker

This fixes the following warning:

sound/soc/codecs/max98088.c:2054:12: warning: 'max98088_i2c_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/max98088.c b/sound/soc/codecs/max98088.c
index e7a40d1..bc22ee9 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -2051,7 +2051,7 @@
        return ret;
 }
 
-static int max98088_i2c_remove(struct i2c_client *client)
+static int __devexit max98088_i2c_remove(struct i2c_client *client)
 {
        snd_soc_unregister_codec(&client->dev);
        kfree(i2c_get_clientdata(client));