ASoC: soc-dai: cleanup cppcheck warning at snd_soc_pcm_dai_new()

This patch cleanups below cppcheck warning.

sound/soc/soc-dai.c:553:13: style: Variable 'ret' is assigned a value that is never used. [unreadVariable]
 int i, ret = 0;
            ^
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87wnomyom1.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dai.c

@@ -595,11 +595,11 @@ int snd_soc_pcm_dai_remove(struct snd_soc_pcm_runtime *rtd, int order)
 int snd_soc_pcm_dai_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_dai *dai;
-	int i, ret = 0;
+	int i;
 
 	for_each_rtd_dais(rtd, i, dai) {
 		if (dai->driver->pcm_new) {
-			ret = dai->driver->pcm_new(rtd, dai);
+			int ret = dai->driver->pcm_new(rtd, dai);
 			if (ret < 0)
 				return soc_dai_ret(dai, ret);
 		}