[PATCH] Segfault patch for state.c

Hi all,

Here is a tiny patch to fix segfault on very first history redo when no 
action has been done.

To reproduce segfault:

1/ Launch JAMin
2/ CTRL-R (or menu/edit/redo)

Bye

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--- state.c-orig	2007-10-06 20:30:38.000000000 +0200
+++ state.c	2007-10-06 20:30:27.000000000 +0200
@@ -395,12 +395,13 @@
 	    undo_pos = g_list_next(undo_pos);
             restore = TRUE;
 	}
-    } else {
-	undo_pos = history;
-	undo_pos = g_list_next(undo_pos);
-        restore = TRUE;
+    } else if (history->next) {
+      undo_pos = history;
+      undo_pos = g_list_next(undo_pos);
+      restore = TRUE;
     }
 
+
     if (restore)
       {
         s_restore_state((s_state *)undo_pos->data);