ASoC: samsung: odroid: Prevent uninitialized variable use

This addresses an issue pointed out by compiler warning:

sound/soc/samsung/odroid.c: In function ‘odroid_audio_probe’:
sound/soc/samsung/odroid.c:298:22: warning: ‘cpu_dai’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
  priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/odroid.c

@@ -194,7 +194,8 @@ static struct snd_soc_dai_link odroid_card_dais[] = {
 static int odroid_audio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *cpu, *cpu_dai, *codec;
+	struct device_node *cpu_dai = NULL;
+	struct device_node *cpu, *codec;
 	struct odroid_priv *priv;
 	struct snd_soc_card *card;
 	struct snd_soc_dai_link *link, *codec_link;
@@ -271,8 +272,11 @@ static int odroid_audio_probe(struct platform_device *pdev)
 		if (ret < 0)
 			break;
 	}
-	if (ret == 0)
+	if (ret == 0) {
 		cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
+		if (!cpu_dai)
+			ret = -EINVAL;
+	}
 
 	of_node_put(cpu);
 	of_node_put(codec);