Fix compile warning, esp32-hal-i2c.c (espressif#2434)

@Tread-Qualitrol discovered this error.

Author: stickbreaker

cores/esp32/esp32-hal-i2c.c

@@ -451,7 +451,7 @@ static void IRAM_ATTR i2cTriggerDumps(i2c_t * i2c, uint8_t trigger, const char l
 static void i2cApbChangeCallback(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
  i2c_t* i2c = (i2c_t*) arg; // recover data
  if(i2c == NULL) { // point to peripheral control block does not exits
- return false;
+ return;
  }
  uint32_t oldFreq=0;
  switch(ev_type){