Make header guards comply with Rule 3.2

refs: #3984

Change-Id: Iec7a0d9ff49cf6124af9e554432ee5f09a199651
diff --git a/nsync/sync-state-leaf-container.h b/nsync/sync-state-leaf-container.h
index d14e635..9f0c272 100644
--- a/nsync/sync-state-leaf-container.h
+++ b/nsync/sync-state-leaf-container.h
@@ -20,8 +20,8 @@
  *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
  */
 
-#ifndef SYNC_STATE_LEAF_CONTAINER
-#define SYNC_STATE_LEAF_CONTAINER
+#ifndef NLSR_NSYNC_SYNC_STATE_LEAF_CONTAINER_H
+#define NLSR_NSYNC_SYNC_STATE_LEAF_CONTAINER_H
 
 #include "sync-leaf.h"
 #include "sync-name-info.h"
@@ -98,4 +98,4 @@
 
 } // Sync
 
-#endif // SYNC_STATE_LEAF_CONTAINER
+#endif // NLSR_NSYNC_SYNC_STATE_LEAF_CONTAINER_H