ASoC: wm8770: Fix wrong number of enum items

wm8770 codec driver defines ain_enum with a wrong number of items.

Use SOC_ENUM_DOUBLE_DECL() macro and it's automatically fixed.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org

sound/soc/codecs/wm8770.c

@@ -196,8 +196,8 @@ static const char *ain_text[] = {
 	"AIN5", "AIN6", "AIN7", "AIN8"
 };
 
-static const struct soc_enum ain_enum =
-	SOC_ENUM_DOUBLE(WM8770_ADCMUX, 0, 4, 8, ain_text);
+static SOC_ENUM_DOUBLE_DECL(ain_enum,
+			    WM8770_ADCMUX, 0, 4, ain_text);
 
 static const struct snd_kcontrol_new ain_mux =
 	SOC_DAPM_ENUM("Capture Mux", ain_enum);