typo

Index: freehdl/kernel-classes.hh
--- freehdl/kernel-classes.hh.orig
+++ freehdl/kernel-classes.hh
@@ -1,5 +1,5 @@
 #ifndef FREEHDL_KERNEL_CLASSES_H
-#define FREEHDL_CLASSES_H
+#define FREEHDL_KERNEL_CLASSES_H
 
 class process_base;
 class acl;