ASoC: rt5665: remove redundant assignment to variable idx

The variable idx is being initialized with a value that is never
read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190705075303.14692-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5665.c

@@ -1478,7 +1478,7 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 	struct rt5665_priv *rt5665 = snd_soc_component_get_drvdata(component);
-	int pd, idx = -EINVAL;
+	int pd, idx;
 
 	pd = rl6231_get_pre_div(rt5665->regmap,
 		RT5665_ADDA_CLK_1, RT5665_I2S_PD1_SFT);