Prep for C++ port

src/avclan/timing.h

@@ -1,8 +1,7 @@
 // Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-#ifndef _TIMING_HPP_
-#define _TIMING_HPP_
+#pragma once
 
 // Physical AVC-LAN bit-phase durations, in microseconds. These are protocol
 // facts (the bus spec), independent of any particular hardware. The active
@@ -31,5 +30,3 @@
 #define AVCLAN_READBIT_THRESHOLD (26.0 / TICK_US)
 
 #define AVCLAN_BIT_LENGTH_MAX (39.1 / TICK_US)
-
-#endif