gpio: max3191x: Use bitmap_free() to free bitmap

kfree() and bitmap_free() are the same. But using the later is more
consistent when freeing memory allocated with bitmap_alloc().
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

drivers/gpio/gpio-max3191x.c

@@ -326,7 +326,7 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
 		bitmap_zero(values, ndescs);
 
 	gpiod_set_array_value_cansleep(ndescs, desc, info, values);
-	kfree(values);
+	bitmap_free(values);
 }
 
 static struct gpio_descs *devm_gpiod_get_array_optional_count(