Tweak some formatting

Marlin/src/HAL/HAL_AVR/MarlinSerial.cpp

@@ -739,8 +739,7 @@
 
 #endif // !USBCON && (UBRRH || UBRR0H || UBRR1H || UBRR2H || UBRR3H)
 
-
+#ifdef INTERNAL_SERIAL_PORT
-#if defined(INTERNAL_SERIAL_PORT)
 
   ISR(SERIAL_REGNAME(USART,INTERNAL_SERIAL_PORT,_RX_vect)) {
     MarlinSerial<MarlinInternalSerialCfg<INTERNAL_SERIAL_PORT>>::store_rxd_char();
@@ -757,6 +756,7 @@
   MarlinSerial<MarlinInternalSerialCfg<INTERNAL_SERIAL_PORT>> internalSerial;
 
 #endif
+
 // For AT90USB targets use the UART for BT interfacing
 #if defined(USBCON) && ENABLED(BLUETOOTH)
   HardwareSerial bluetoothSerial;

Marlin/src/HAL/HAL_AVR/MarlinSerial.h

@@ -276,7 +276,7 @@
 #endif // !USBCON
 
 
-#if defined(INTERNAL_SERIAL_PORT)
+#ifdef INTERNAL_SERIAL_PORT
   template <uint8_t serial>
   struct MarlinInternalSerialCfg {
     static constexpr int PORT               = serial;

Marlin/src/lcd/dogm/HAL_LCD_com_defines.h

@@ -47,7 +47,7 @@
   uint8_t u8g_com_HAL_LPC1768_ssd_hw_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
   #define U8G_COM_SSD_I2C_HAL u8g_com_arduino_ssd_i2c_fn
 
-  #if defined(ARDUINO_ARCH_STM32F1)
+  #ifdef ARDUINO_ARCH_STM32F1
     uint8_t u8g_com_stm32duino_fsmc_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
     #define U8G_COM_HAL_FSMC_FN u8g_com_stm32duino_fsmc_fn
   #else