mfd: pcf50633: Remove unneded ret variable

The ret variable is not needed since is not used in the
function. Remove the variable and just return 0 instead.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/pcf50633-irq.c

···
 static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
 {
 	u8 reg, bit;
-	int ret = 0, idx;
+	int idx;
 
 	idx = irq >> 3;
 	reg = PCF50633_REG_INT1M + idx;
···
 
 	mutex_unlock(&pcf->lock);
 
-	return ret;
+	return 0;
 }
 
 int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)