ASoC: Remove unused "control_data" field of struct wm8960_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/wm8960.c

@@ -72,7 +72,6 @@ static const u16 wm8960_reg[WM8960_CACHEREGNUM] = {
 
 struct wm8960_priv {
 	enum snd_soc_control_type control_type;
-	void *control_data;
 	int (*set_bias_level)(struct snd_soc_codec *,
 			      enum snd_soc_bias_level level);
 	struct snd_soc_dapm_widget *lout1;
@@ -925,7 +924,6 @@ static int wm8960_probe(struct snd_soc_codec *codec)
 	u16 reg;
 
 	wm8960->set_bias_level = wm8960_set_bias_level_out3;
-	codec->control_data = wm8960->control_data;
 
 	if (!pdata) {
 		dev_warn(codec->dev, "No platform data supplied\n");
@@ -1015,7 +1013,6 @@ static __devinit int wm8960_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, wm8960);
 	wm8960->control_type = SND_SOC_I2C;
-	wm8960->control_data = i2c;
 
 	ret = snd_soc_register_codec(&i2c->dev,
 			&soc_codec_dev_wm8960, &wm8960_dai, 1);