pinctrl: stm32: Fix bad function call

In stm32_pconf_parse_conf function, stm32_pmx_gpio_set_direction is
called with wrong parameter value. Indeed, using NULL value for range
will raise an oops.

Fixes: aceb16dc2da5 ("pinctrl: Add STM32 MCUs support")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/stm32/pinctrl-stm32.c

@@ -798,7 +798,7 @@ static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
 		break;
 	case PIN_CONFIG_OUTPUT:
 		__stm32_gpio_set(bank, offset, arg);
-		ret = stm32_pmx_gpio_set_direction(pctldev, NULL, pin, false);
+		ret = stm32_pmx_gpio_set_direction(pctldev, range, pin, false);
 		break;
 	default:
 		ret = -EINVAL;