sound: soc: codecs: mt6358: change return type of mt6358_codec_init_reg

As mt6358_codec_init_reg function always returns 0 , change return type
from int to void.

fixes below issue reported by coccicheck
sound/soc/codecs/mt6358.c:2260:5-8: Unneeded variable: "ret". Return "0"
on line 2289
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Acked-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20190709182543.GA6611@hari-Inspiron-1545Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/mt6358.c

@@ -2255,10 +2255,8 @@ static struct snd_soc_dai_driver mt6358_dai_driver[] = {
 	},
 };
 
-static int mt6358_codec_init_reg(struct mt6358_priv *priv)
+static void mt6358_codec_init_reg(struct mt6358_priv *priv)
 {
-	int ret = 0;
-
 	/* Disable HeadphoneL/HeadphoneR short circuit protection */
 	regmap_update_bits(priv->regmap, MT6358_AUDDEC_ANA_CON0,
 			   RG_AUDHPLSCDISABLE_VAUDP15_MASK_SFT,
@@ -2285,8 +2283,6 @@ static int mt6358_codec_init_reg(struct mt6358_priv *priv)
 	/* set gpio */
 	playback_gpio_reset(priv);
 	capture_gpio_reset(priv);
-
-	return ret;
 }
 
 static int mt6358_codec_probe(struct snd_soc_component *cmpnt)