mfd: arizona: Remove unused variable

Left over as bitrot from previous changes.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/arizona-irq.c

@@ -95,7 +95,7 @@ static irqreturn_t arizona_irq_thread(int irq, void *data)
 {
 	struct arizona *arizona = data;
 	unsigned int val;
-	int i, ret;
+	int ret;
 
 	ret = pm_runtime_get_sync(arizona->dev);
 	if (ret < 0) {