gpio: nuvoton: Fix sgpio irq handle error

The generic_handle_domain_irq() function calls irq_resolve_mapping().
Thus delete a duplicative irq_find_mapping() call
so that a stack trace and an RCU stall will be avoided.

Fixes: c4f8457d17ce ("gpio: nuvoton: Add Nuvoton NPCM sgpio driver")
Signed-off-by: Jim Liu <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Reviewed-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-npcm-sgpio.c

···
 	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
 	struct irq_chip *ic = irq_desc_get_chip(desc);
 	struct npcm_sgpio *gpio = gpiochip_get_data(gc);
-	unsigned int i, j, girq;
+	unsigned int i, j;
 	unsigned long reg;
 
 	chained_irq_enter(ic, desc);
···
 		const struct npcm_sgpio_bank *bank = &npcm_sgpio_banks[i];
 
 		reg = ioread8(bank_reg(gpio, bank, EVENT_STS));
-		for_each_set_bit(j, &reg, 8) {
-			girq = irq_find_mapping(gc->irq.domain,
-						i * 8 + gpio->nout_sgpio + j);
-			generic_handle_domain_irq(gc->irq.domain, girq);
-		}
+		for_each_set_bit(j, &reg, 8)
+			generic_handle_domain_irq(gc->irq.domain,
+						  i * 8 + gpio->nout_sgpio + j);
 	}
 
 	chained_irq_exit(ic, desc);