hwmon: (asus_atk0110) Use PTR_ERR_OR_ZERO instead of reimplementing its function

PTR_ERR_OR_ZERO has implemented the same function. We prefer to use
inlined function rather than code-opened implementation.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>