===== dlist.c 1.3 vs edited =====
--- 1.3/libsysfs/dlist.c	Wed Mar 10 18:12:14 2004
+++ edited/dlist.c	Thu Mar 18 13:11:00 2004
@@ -74,14 +74,14 @@
 {
   if(direction)
     {
-      if( list->marker->next!=NULL)
+      if( list->marker && list->marker->next!=NULL)
 	list->marker=list->marker->next;
       else
 	return(NULL);
     }
   else
     {
-      if( list->marker->prev!=NULL)
+      if( list->marker && list->marker->prev!=NULL)
 	list->marker=list->marker->prev;
       else
 	return(NULL);