ASoC: rt5659: Staticise rt5659_i2c_shutdown

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5659.c

@@ -4184,7 +4184,7 @@ static int rt5659_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
-void rt5659_i2c_shutdown(struct i2c_client *client)
+static void rt5659_i2c_shutdown(struct i2c_client *client)
 {
 	struct rt5659_priv *rt5659 = i2c_get_clientdata(client);