pinctrl: bcm2835: Replace BUG with BUG_ON

The if condition followed by BUG can be replaced to BUG_ON which is
more compact and formal in linux source.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20210624064913.41788-1-wangborong@cdjrlc.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/pinctrl-bcm2835.c

@@ -416,8 +416,7 @@ static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
 		}
 	}
 	/* This should not happen, every IRQ has a bank */
-	if (i == BCM2835_NUM_IRQS)
-		BUG();
+	BUG_ON(i == BCM2835_NUM_IRQS);
 
 	chained_irq_enter(host_chip, desc);