ASoC: cht-bsw-rt5645: fix unused variable compiler warning

Missed unused variable in previous changes, oops.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/cht_bsw_rt5645.c

@@ -262,7 +262,6 @@ static int cht_codec_init(struct snd_soc_pcm_runtime *runtime)
 	int jack_type;
 	struct snd_soc_codec *codec = runtime->codec;
 	struct snd_soc_card *card = runtime->card;
-	struct snd_soc_dai *codec_dai = runtime->codec_dai;
 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(runtime->card);
 
 	if ((cht_rt5645_quirk & CHT_RT5645_SSP2_AIF2) ||