soundwire: intel: remove unnecessary init

cppcheck warning:

drivers/soundwire/intel.c:1487:10: 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>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20211224021034.26635-7-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/soundwire/intel.c

@@ -1613,7 +1613,7 @@ static int __maybe_unused intel_pm_prepare(struct device *dev)
 	struct sdw_intel *sdw = cdns_to_intel(cdns);
 	struct sdw_bus *bus = &cdns->bus;
 	u32 clock_stop_quirks;
-	int ret = 0;
+	int ret;
 
 	if (bus->prop.hw_disabled || !sdw->startup_done) {
 		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",