ASoC: core: Remove unused variable 'min'

commit 4183eed2 (ASoC: core: Add signed multi register control) introduced
the variable 'min',but it is not used.

Remove it to fix the following build warning:

sound/soc/soc-core.c: In function 'snd_soc_put_xr_sx':
sound/soc/soc-core.c:2990: warning: unused variable 'min'
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-core.c

@@ -2987,7 +2987,6 @@ int snd_soc_put_xr_sx(struct snd_kcontrol *kcontrol,
 	unsigned int regwmask = (1<<regwshift)-1;
 	unsigned int invert = mc->invert;
 	unsigned long mask = (1UL<<mc->nbits)-1;
-	long min = mc->min;
 	long max = mc->max;
 	long val = ucontrol->value.integer.value[0];
 	unsigned int i, regval, regmask;