pinctrl: nuvoton: wpcm450: off by one in wpcm450_gpio_register()

The > WPCM450_NUM_BANKS should be >= or it leads to an out of bounds
access on the next line.

Fixes: a1d1e0e3 ("pinctrl: nuvoton: Add driver for WPCM450")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220318071131.GA29472@kiliSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/nuvoton/pinctrl-wpcm450.c

@@ -1043,7 +1043,7 @@ static int wpcm450_gpio_register(struct platform_device *pdev,
 		gpio = &pctrl->gpio_bank[reg];
 		gpio->pctrl = pctrl;
 
-		if (reg > WPCM450_NUM_BANKS)
+		if (reg >= WPCM450_NUM_BANKS)
 			return dev_err_probe(dev, -EINVAL,
 					     "GPIO index %d out of range!\n", reg);