Update esp32_ledc_mcu.cpp to ensure ledc_timer is initialised to a kn…

…own state (ledc_timer = false)

src/drivers/hardware_specific/esp32/esp32_ledc_mcu.cpp

@@ -76,6 +76,7 @@ bool _ledcAttachChannelAdvanced(uint8_t pin, int _channel, int _group, uint32_t
 
   ledc_timer_bit_t res = static_cast<ledc_timer_bit_t>(resolution);
   ledc_timer_config_t ledc_timer;
+  memset(&ledc_timer, 0, sizeof(ledc_timer));
   ledc_timer.speed_mode = group;
   ledc_timer.timer_num = LEDC_TIMER_0;
   ledc_timer.duty_resolution = res;
@@ -401,4 +402,4 @@ void _writeDutyCycle6PWM(float dc_a,  float dc_b, float dc_c,  PhaseState *phase
   _setPwmPairDutyCycle(params, 4, 5, dc_c, ((ESP32LEDCDriverParams*)params)->dead_zone, phase_state[2]);
 }
 
-#endif
+#endif