Update header guards msf.h
-#ifndef __MSF_H
-#define __MSF_H
+#ifndef OPENWSN_MSF_H
+#define OPENWSN_MSF_H
/**
\addtogroup MAChigh
@@ -88,4 +88,4 @@ uint8_t msf_getPreviousNumCellsUsed(cellType_t cellType);
\}
*/
-#endif
+#endif /* OPENWSN_MSF_H */
