hwmon: (pwmfan) Do not force disable pwm controller

hwmon: (pwmfan) Do not force disable pwm controller

The pwm1_enable attribute of the pwmfan driver influences the mode of
operation, especially in case of a requested pwm1 duty cycle of zero.
Especially setting pwm1_enable to two, should keep the pwm controller
enabled even if the duty cycle is set to zero [1].

This is not the case at the moment, as the pwm controller is disabled
always if pwm1 is set to zero.

This commit tries to fix this behavior.

[1] https://docs.kernel.org/hwmon/pwm-fan.html

Signed-off-by: Johannes Kirchmair <johannes.kirchmair@skidata.com>
Message-ID: <20240827054454.521494-1-mailinglist1@johanneskirchmair.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>