ASoC: adau1701: Initialize codec->control_data before using it

Currently codec->control_data is not initialized before calling
process_sigma_firmware(codec->control_data, ADAU1701_FIRMWARE).

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/adau1701.c

@@ -458,6 +458,7 @@ static int adau1701_probe(struct snd_soc_codec *codec)
 	int ret;
 
 	codec->dapm.idle_bias_off = 1;
+	codec->control_data = to_i2c_client(codec->dev);
 
 	ret = adau1701_load_firmware(codec);
 	if (ret)