ASoC: Remove unused "control_data" field of struct alc5623_priv

The control_data field is used to initialize the codec's control_data field,
but since this is also done by the snd-soc-cache core, the redundant
assignment can be removed and the field can be dropped.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/alc5623.c

@@ -40,7 +40,6 @@ MODULE_PARM_DESC(caps_charge, "ALC5623 cap charge time (msecs)");
 /* codec private data */
 struct alc5623_priv {
 	enum snd_soc_control_type control_type;
-	void *control_data;
 	u8 id;
 	unsigned int sysclk;
 	u16 reg_cache[ALC5623_VENDOR_ID2+2];
@@ -1049,7 +1048,6 @@ static int alc5623_i2c_probe(struct i2c_client *client,
 	}
 
 	i2c_set_clientdata(client, alc5623);
-	alc5623->control_data = client;
 	alc5623->control_type = SND_SOC_I2C;
 
 	ret =  snd_soc_register_codec(&client->dev,