staging: mt7621-gpio: avoid one level indentation in interrupt handler

There is no need to check for 'pending' before loop over the
interrupts using 'for_each_set_bit' if nothing is set the
return values will be the same so just avoid this check avoiding
also one level intentation and improving readability.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-gpio/gpio-mt7621.c

@@ -93,14 +93,12 @@ mediatek_gpio_irq_handler(int irq, void *data)
 
 	pending = mtk_gpio_r32(rg, GPIO_REG_STAT);
 
-	if (pending) {
-		for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
-			u32 map = irq_find_mapping(gc->irq.domain, bit);
+	for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
+		u32 map = irq_find_mapping(gc->irq.domain, bit);
 
-			generic_handle_irq(map);
-			mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
-			ret |= IRQ_HANDLED;
-		}
+		generic_handle_irq(map);
+		mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
+		ret |= IRQ_HANDLED;
 	}
 
 	return ret;