Tone: Added missing break

Author: onovy

hardware/arduino/avr/cores/arduino/Tone.cpp

@@ -117,7 +117,7 @@ static uint8_t tone_pins[AVAILABLE_TONE_PINS] = { 255 /*, 255 */ };
 #define AVAILABLE_TONE_PINS 1
 #define USE_TIMER2
 
-// Leave timer 0 to last.
+// Leave timer 2 to last.
 const uint8_t PROGMEM tone_pin_to_timer_PGM[] = { 2 /*, 1, 0 */ };
 static uint8_t tone_pins[AVAILABLE_TONE_PINS] = { 255 /*, 255, 255 */ };
 
@@ -485,6 +485,7 @@ void noTone(uint8_t _pin)
     if (tone_pins[i] == _pin) {
       _timer = pgm_read_byte(tone_pin_to_timer_PGM + i);
       tone_pins[i] = 255;
+      break;
     }
   }