Memory leak in log_printf (when printing exactly 64 characters plus trailing \0)

[felixstorm]

Same problem as reported (and fixed) here: #2201

Buffer is being allocated if vsnprintf reports 64 or more characters (due to the trailing \0):

arduino-esp32/cores/esp32/esp32-hal-uart.c

Lines 440 to 441 in 310e78e

	if(len >= sizeof(loc_buf)){
	temp = (char*)malloc(len+1);

But the buffer is only being released if more than 64 characters had been reported by vsnprintf:

arduino-esp32/cores/esp32/esp32-hal-uart.c

Lines 459 to 460 in 310e78e

	if(len > 64){
	free(temp);

Probably related: #2033 (happens only when debug is on and free heap drops by 64 bytes each time)

Code to reproduce:

log_printf("1234567890123456789012345678901234567890123456789012345678901234");