hwmon: (corsair-psu) fix plain integer used as NULL pointer

sparse warnings: (new ones prefixed by >>)
>> drivers/hwmon/corsair-psu.c:536:82: sparse: sparse: Using plain
integer as NULL pointer

Fixes: d115b51e0e56 ("hwmon: add Corsair PSU HID controller driver")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Wilken Gottwalt <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/corsair-psu.c

···
 	corsairpsu_check_cmd_support(priv);
 
 	priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "corsairpsu", priv,
-							  &corsairpsu_chip_info, 0);
+							  &corsairpsu_chip_info, NULL);
 
 	if (IS_ERR(priv->hwmon_dev)) {
 		ret = PTR_ERR(priv->hwmon_dev);