Function print2u

Marlin/src/sd/SdBaseFile.cpp:1285–1288

print uint8_t with width 2

// print uint8_t with width 2
static void print2u(const uint8_t v) {
  if (v < 10) SERIAL_CHAR('0');
  SERIAL_ECHO(v);
}

/**
 * %Print a directory date field to Serial.