Add include guard in headers files (#8108)

Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>

src/drivers/airspeed/airspeed.h

@@ -31,6 +31,8 @@
  *
  ****************************************************************************/
 
+#pragma once
+
 #include <drivers/device/i2c.h>
 #include <drivers/drv_airspeed.h>
 #include <drivers/drv_hrt.h>

src/drivers/boards/sim/board_config.h

@@ -1,3 +1,5 @@
+#pragma once
+
 /*
  * I2C busses
  */

src/drivers/device/vfile.h

@@ -38,6 +38,8 @@
  * @author Mark Charlebois <charlebm@gmail.com>
  */
 
+#pragma once
+
 #include <px4_tasks.h>
 #include <drivers/drv_device.h>
 #include "device.h"

src/drivers/linux_gpio/linux_gpio.h

@@ -41,6 +41,7 @@
  * @author Nicolae Rosia <nicolae.rosia@gmail.com>
  */
 
+#pragma once
 
 class LinuxGPIO
 {

src/drivers/linux_sbus/linux_sbus.h

@@ -33,6 +33,8 @@
  *
  ****************************************************************************/
 
+#pragma once
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ipc.h>

src/drivers/mpl3115a2/mpl3115a2.h

@@ -37,6 +37,8 @@
  * Shared defines for the mpl3115a2 driver.
  */
 
+#pragma once
+
 #define MPL3115A2_REG_WHO_AM_I   0x0c
 #define MPL3115A2_WHO_AM_I       0xC4
 

src/drivers/sf0x/sf0x_parser.h

@@ -38,6 +38,8 @@
  * Declarations of parser for the Lightware SF0x laser rangefinder series
  */
 
+#pragma once
+
 enum SF0X_PARSE_STATE {
 	SF0X_PARSE_STATE0_UNSYNC = 0,
 	SF0X_PARSE_STATE1_SYNC,
@@ -48,4 +50,4 @@ enum SF0X_PARSE_STATE {
 	SF0X_PARSE_STATE6_GOT_CARRIAGE_RETURN
 };
 
-int sf0x_parser(char c, char *parserbuf, unsigned *parserbuf_index, enum SF0X_PARSE_STATE *state, float *dist);
+int sf0x_parser(char c, char *parserbuf, unsigned *parserbuf_index, enum SF0X_PARSE_STATE *state, float *dist);