ASoC: rt5677: remove useless assignment

cppcheck warning:

sound/soc/codecs/rt5677.c:5335:10: style: Variable 'ret' is assigned a
value that is never used. [unreadVariable]
 int ret = 0, loop, i, reg_irq, virq;
         ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302212527.55158-22-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5677.c

@@ -5332,7 +5332,7 @@ static bool rt5677_check_hotword(struct rt5677_priv *rt5677)
 static irqreturn_t rt5677_irq(int unused, void *data)
 {
 	struct rt5677_priv *rt5677 = data;
-	int ret = 0, loop, i, reg_irq, virq;
+	int ret, loop, i, reg_irq, virq;
 	bool irq_fired = false;
 
 	mutex_lock(&rt5677->irq_lock);