pinctrl: sh-pfc: Let gpio_chip.to_irq() return zero on error

Currrently the gpio_chip.to_irq() callback returns -ENOSYS on error,
which causes bad interactions with the serial_mctrl_gpio helpers.

mctrl_gpio_init() returns -ENOSYS if GPIOLIB is not enabled, which is
intended to be ignored by its callers. However, ignoring -ENOSYS when it
was caused by a gpiod_to_irq() failure will lead to a crash later:

Unable to handle kernel paging request at virtual address ffffffde
...
PC is at mctrl_gpio_set+0x14/0x78

Fix this by returning zero instead, like gpiochip_to_irq() does.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/sh-pfc/gpio.c

···
 		}
 	}
 
-	return -ENOSYS;
+	return 0;
 
 found:
 	return pfc->irqs[i];