Fan: fix code review issue

When pwmMaxValue <= pwmMinValue (due to misconfiguration), the function returns without updating the fan speed, leaving it at its previous state. This could cause overheating if the fan isn't already running at an appropriate speed.

Author: qistoph

usermods/PWM_fan/PWM_fan.cpp

@@ -169,7 +169,10 @@ class PWMFanUsermod : public Usermod {
       int pwmMinValue = minPWMValuePct * _pwmMaxValue / 100;
       int pwmMaxValue = maxPWMValuePct * _pwmMaxValue / 100;
 
-      if (pwmMaxValue <= pwmMinValue) return;
+      if (pwmMaxValue <= pwmMinValue) {
+        updateFanSpeed(pwmMaxValue); // fail safe: run at max speed
+        return;
+      }
 
       int pwmRange = pwmMaxValue - pwmMinValue;