AP_Airspeed: replace header guard with pragma once

libraries/AP_Airspeed/AP_Airspeed_Backend.h

@@ -14,11 +14,11 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 /*
   backend driver class for airspeed
  */
-#pragma once
 
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>

libraries/AP_Airspeed/AP_Airspeed_I2C.h

@@ -14,11 +14,11 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 /*
   backend driver for airspeed from I2C
  */
-#pragma once
 
 #include <AP_HAL/AP_HAL.h>
 

libraries/AP_Airspeed/AP_Airspeed_PX4.h

@@ -14,11 +14,11 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 /*
   backend driver for airspeed from PX4Firmware
  */
-#pragma once
 
 #include <AP_HAL/AP_HAL.h>
 #include "AP_Airspeed_Backend.h"