ASoC: generic: simple-card-utils: remove useless assignment

cppcheck warning:

sound/soc/generic/simple-card-utils.c:258:10: style: Variable 'ret' is
assigned a value that is never used. [unreadVariable]
 int ret = 0;
         ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210218221921.88991-7-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/simple-card-utils.c

@@ -254,7 +254,7 @@ int asoc_simple_hw_params(struct snd_pcm_substream *substream,
 	struct simple_dai_props *dai_props =
 		simple_priv_to_props(priv, rtd->num);
 	unsigned int mclk, mclk_fs = 0;
-	int ret = 0;
+	int ret;
 
 	if (dai_props->mclk_fs)
 		mclk_fs = dai_props->mclk_fs;