hwmon: (pwm-fan) Explicitly switch off fan power when setting pwm1_enable to 0

When pwm1_enable is changed from 1 to 0 while pwm1 == 0, the regulator
is not switched off as expected. The reason is that when the fan is
already off, ctx->enabled is false, so pwm_fan_power_off() will be a
no-op.

Handle this case explicitly in pwm_fan_update_enable() by calling
pwm_fan_switch_power() directly.

Fixes: b99152d4 ("hwmon: (pwm-fan) Switch regulator dynamically")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/20221013135951.4902-1-matthias.schiffer@ew.tq-group.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pwm-fan.c

@@ -257,7 +257,10 @@ static int pwm_fan_update_enable(struct pwm_fan_ctx *ctx, long val)
 
 	if (val == 0) {
 		/* Disable pwm-fan unconditionally */
-		ret = __set_pwm(ctx, 0);
+		if (ctx->enabled)
+			ret = __set_pwm(ctx, 0);
+		else
+			ret = pwm_fan_switch_power(ctx, false);
 		if (ret)
 			ctx->enable_mode = old_val;
 		pwm_fan_update_state(ctx, 0);