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 <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/bcm/pinctrl-bcm2835.c

···
 		}
 	}
 	/* 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);