ASoC: mediatek: mt8195: simplify error handling

cppcheck warnings:

sound/soc/mediatek/mt8195/mt8195-afe-clk.c:311:9: warning: Identical
condition and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
 return ret;
        ^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:297:6: note: If condition
'ret' is true, the function will return/exit
 if (ret)
     ^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:311:9: note: Returning
identical expression 'ret'
 return ret;
        ^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:341:9: warning: Identical
condition and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
 return ret;
        ^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:338:6: note: If condition
'ret' is true, the function will return/exit
if (ret)
     ^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:341:9: 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/20220520211719.607543-12-pierre-louis.bossart@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8195/mt8195-afe-clk.c

@@ -284,7 +284,7 @@ static int mt8195_afe_enable_apll_tuner(struct mtk_base_afe *afe,
 {
 	struct mt8195_afe_tuner_cfg *cfg = mt8195_afe_found_apll_tuner(id);
 	unsigned long flags;
-	int ret = 0;
+	int ret;
 
 	if (!cfg)
 		return -EINVAL;
@@ -308,7 +308,7 @@ static int mt8195_afe_enable_apll_tuner(struct mtk_base_afe *afe,
 
 	spin_unlock_irqrestore(&cfg->ctrl_lock, flags);
 
-	return ret;
+	return 0;
 }
 
 static int mt8195_afe_disable_apll_tuner(struct mtk_base_afe *afe,
@@ -316,7 +316,7 @@ static int mt8195_afe_disable_apll_tuner(struct mtk_base_afe *afe,
 {
 	struct mt8195_afe_tuner_cfg *cfg = mt8195_afe_found_apll_tuner(id);
 	unsigned long flags;
-	int ret = 0;
+	int ret;
 
 	if (!cfg)
 		return -EINVAL;
@@ -338,7 +338,7 @@ static int mt8195_afe_disable_apll_tuner(struct mtk_base_afe *afe,
 	if (ret)
 		return ret;
 
-	return ret;
+	return 0;
 }
 
 int mt8195_afe_get_mclk_source_clk_id(int sel)