gpio: brcmstb: Return proper error if bank width is invalid

Return proper error in brcmstb_gpio_probe if bank width is invalid.

Signed-off-by: Axel Lin <[e-mail]>
Acked-by: Gregory Fong <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-brcmstb.c

···
 		bank->id = num_banks;
 		if (bank_width <= 0 || bank_width > MAX_GPIO_PER_BANK) {
 			dev_err(dev, "Invalid bank width %d\n", bank_width);
+			err = -EINVAL;
 			goto fail;
 		} else {
 			bank->width = bank_width;