Minor HAL cleanup

Marlin/src/HAL/STM32/SoftwareSerial.h

@@ -29,9 +29,7 @@
  * The latest version of this library can always be found at
  * http://arduiniana.org.
  */
-
-#ifndef SOFTWARESERIAL_H
-#define SOFTWARESERIAL_H
+#pragma once
 
 #include <Arduino.h>
 
@@ -64,7 +62,6 @@ class SoftwareSerial : public Stream {
     uint32_t delta_start = 0;
 
     // static data
-    static bool initialised;
     static HardwareTimer timer;
     static const IRQn_Type timer_interrupt_number;
     static uint32_t timer_interrupt_priority;
@@ -91,7 +88,7 @@ class SoftwareSerial : public Stream {
   public:
     // public methods
 
-    SoftwareSerial(uint16_t receivePin, uint16_t transmitPin, bool inverse_logic = false);
+    SoftwareSerial(uint16_t receivePin, uint16_t transmitPin, bool inverse_logic=false);
     virtual ~SoftwareSerial();
     void begin(long speed);
     bool listen();
@@ -115,5 +112,3 @@ class SoftwareSerial : public Stream {
 
     using Print::write;
 };
-
-#endif // SOFTWARESERIAL_H