ASoC: wcd938x: simplify return value

cppcheck warning:

sound/soc/codecs/wcd938x.c:3701:9: warning: Identical condition and
return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]

 return ret;
        ^
sound/soc/codecs/wcd938x.c:3691:6: note: If condition 'ret' is true,
        the function will return/exit
 if (ret)
     ^
sound/soc/codecs/wcd938x.c:3701:9: note: Returning identical expression 'ret'
 return ret;
        ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210804192456.278702-4-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd938x.c

@@ -3698,7 +3698,7 @@ static int wcd938x_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	pm_runtime_idle(dev);
 
-	return ret;
+	return 0;
 }
 
 static int wcd938x_remove(struct platform_device *pdev)