ASoC: rockchip: simplify error handling

cppcheck warning:

sound/soc/rockchip/rk3288_hdmi_analog.c:256:9: warning: Identical
condition and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
 return ret;
        ^
sound/soc/rockchip/rk3288_hdmi_analog.c:252:6: note: If condition
'ret' is true, the function will return/exit
 if (ret)
     ^
sound/soc/rockchip/rk3288_hdmi_analog.c:256:9: note: Returning
identical expression 'ret'
 return ret;
        ^
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: NBard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: NPéter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220520211719.607543-15-pierre-louis.bossart@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/rockchip/rk3288_hdmi_analog.c

@@ -169,7 +169,7 @@ static struct snd_soc_card snd_soc_card_rk = {
 
 static int snd_rk_mc_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret;
 	struct snd_soc_card *card = &snd_soc_card_rk;
 	struct device_node *np = pdev->dev.of_node;
 	struct rk_drvdata *machine;
@@ -253,7 +253,7 @@ static int snd_rk_mc_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, ret,
 				     "Soc register card failed\n");
 
-	return ret;
+	return 0;
 }
 
 static const struct of_device_id rockchip_sound_of_match[] = {