hwmon: (it87) Check for a valid chip before using force_id

Check there is a chip before using force_id parameter as there
is no value in registering a non-existent chip

Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
Link: https://lore.kernel.org/r/20221004210100.540120-3-ahmad@khalifa.ws


Signed-off-by: Guenter Roeck <linux@roeck-us.net>