gpiolib: remove unnecessary argument from set_config call

Remove unnecessary argument when setting PIN_CONFIG_BIAS_DISABLE. No
argument is expected by pinctrl, so removing it should be harmless.

Fixes: 2148ad7790 ("gpiolib: add support for disabling line bias")
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpiolib.c

@@ -3051,7 +3051,6 @@ static int gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 	unsigned arg;
 
 	switch (mode) {
-	case PIN_CONFIG_BIAS_DISABLE:
 	case PIN_CONFIG_BIAS_PULL_DOWN:
 	case PIN_CONFIG_BIAS_PULL_UP:
 		arg = 1;