Make #include guard naming consistent

Change-Id: Ie13e8af0bb74ed290f811dcad64ad06c9d8cb4fa
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/2956
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

src/flash/mflash.h

@@ -15,8 +15,8 @@
  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
-#ifndef _MFLASH_H
-#define _MFLASH_H
+#ifndef OPENOCD_FLASH_MFLASH_H
+#define OPENOCD_FLASH_MFLASH_H
 
 struct command_context;
 
@@ -286,4 +286,4 @@ typedef enum _mg_opmode {
 	mg_op_mode_stg = 0	/* Only Storage */
 } mg_opmode;
 
-#endif
+#endif /* OPENOCD_FLASH_MFLASH_H */