ASoC: Intel: Atom: remove redundant initialization

Fix cppcheck warnings:

sound/soc/intel/atom/sst/sst.c:427:13: style: Variable 'ret' is
assigned a value that is never used. [unreadVariable]
 int i, ret = 0;
            ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200813200147.61990-6-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/atom/sst/sst.c

@@ -423,7 +423,7 @@ static int intel_sst_suspend(struct device *dev)
 {
 	struct intel_sst_drv *ctx = dev_get_drvdata(dev);
 	struct sst_fw_save *fw_save;
-	int i, ret = 0;
+	int i, ret;
 
 	/* check first if we are already in SW reset */
 	if (ctx->sst_state == SST_RESET)