ASoC: Remove unused function check_vdac_to_outmix from rt5631

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/rt5631.c

diff --git a/sound/soc/codecs/rt5631.c b/sound/soc/codecs/rt5631.c
index 7e1f894..86e69f4 100644
--- a/sound/soc/codecs/rt5631.c
+++ b/sound/soc/codecs/rt5631.c
@@ -343,20 +343,6 @@
 	return !(reg & RT5631_M_DAC_R_TO_SPKMIXER_R);
 }
 
-static int check_vdac_to_outmix(struct snd_soc_dapm_widget *source,
-			 struct snd_soc_dapm_widget *sink)
-{
-	unsigned int reg, ret = 1;
-
-	reg = snd_soc_read(source->codec, RT5631_OUTMIXER_L_CTRL);
-	if (reg & RT5631_M_VDAC_TO_OUTMIXER_L) {
-		reg = snd_soc_read(source->codec, RT5631_OUTMIXER_R_CTRL);
-		if (reg & RT5631_M_VDAC_TO_OUTMIXER_R)
-			ret = 0;
-	}
-	return ret;
-}
-
 static int check_adcl_select(struct snd_soc_dapm_widget *source,
 			 struct snd_soc_dapm_widget *sink)
 {