Suppress warning

Marlin/Marlin_main.cpp

@@ -8487,13 +8487,10 @@ void prepare_move_to_destination() {
   void handle_status_leds(void) {
     if (ELAPSED(millis(), next_status_led_update_ms)) {
       next_status_led_update_ms += 500; // Update every 0.5s
-      float max_temp =
-        #if HAS_TEMP_BED
-          MAX3(max_temp, thermalManager.degTargetBed(), thermalManager.degBed())
-        #else
-          0.0
-        #endif
-      ;
+      float max_temp = 0.0;
+      #if HAS_TEMP_BED
+        max_temp = MAX3(max_temp, thermalManager.degTargetBed(), thermalManager.degBed());
+      #endif
       HOTEND_LOOP() {
         max_temp = MAX3(max_temp, thermalManager.degHotend(e), thermalManager.degTargetHotend(e));
       }

Marlin/temperature.cpp

@@ -479,7 +479,7 @@ int Temperature::getHeaterPower(int heater) {
     }
  
     uint8_t fanDone = 0;
-    for (int8_t f = 0; f < COUNT(fanPin); f++) {
+    for (uint8_t f = 0; f < COUNT(fanPin); f++) {
       int8_t pin = fanPin[f];
       if (pin >= 0 && !TEST(fanDone, fanBit[f])) {
         unsigned char newFanSpeed = TEST(fanState, fanBit[f]) ? EXTRUDER_AUTO_FAN_SPEED : 0;