ASoC: Intel: Atom: sst_pvt: remove redundant initialization

Fix cppcheck warning:

sound/soc/intel/atom/sst/sst_pvt.c:201:9: warning: Identical condition
and return expression 'retval', return value is always 0
[identicalConditionAfterEarlyExit]
 return retval;
        ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200813200147.61990-7-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -188,7 +188,7 @@ int sst_create_block_and_ipc_msg(struct ipc_post **arg, bool large,
 		struct intel_sst_drv *sst_drv_ctx, struct sst_block **block,
 		u32 msg_id, u32 drv_id)
 {
-	int retval = 0;
+	int retval;
 
 	retval = sst_create_ipc_msg(arg, large);
 	if (retval)