From 3fbd32170a92d8134e16417a9345fe0e837ee659 Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@courtesan.com>
Date: Thu, 6 Mar 2008 17:31:57 +0000
Subject: [PATCH] add DEBUG to list2tq

---
 list.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/list.c b/list.c
index 695523b91..1a17a1d13 100644
--- a/list.c
+++ b/list.c
@@ -82,6 +82,12 @@ list2tq(vh, vl)
     struct list_proto *l = (struct list_proto *)vl;
 
     if (l != NULL) {
+#ifdef DEBUG
+	if (l->prev == NULL) {
+	    warningx("list2tq called with non-semicircular list");
+	    abort();
+	}
+#endif
 	h->first = l;
 	h->last = l->prev;	/* l->prev points to the last member of l */
 	l->prev = NULL;		/* zero last ptr now that we have a head */
-- 
2.40.0