ASoC: WM8804: Refactor set_pll code to avoid GCC warnings

Ensure that no uninitialised variable warnings are generated by
GCC.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8804.c

@@ -390,16 +390,20 @@ static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
 			  int source, unsigned int freq_in,
 			  unsigned int freq_out)
 {
-	int ret;
 	struct snd_soc_codec *codec;
-	struct pll_div pll_div = { 0 };
 
 	codec = dai->codec;
-	if (freq_in && freq_out) {
+	if (!freq_in || !freq_out) {
+		/* disable the PLL */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
+		return 0;
+	} else {
+		int ret;
+		struct pll_div pll_div;
+
 		ret = pll_factors(&pll_div, freq_out, freq_in);
 		if (ret)
 			return ret;
-	}
 
 		/* power down the PLL before reprogramming it */
 		snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
@@ -420,6 +424,7 @@ static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
 
 		/* power up the PLL */
 		snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
+	}
 
 	return 0;
 }