Add an assert, just in case.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@612 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_expire.c

@@ -123,6 +123,12 @@ exp_prefetch(void *arg)
 			continue;
 		}
 		binheap_delete(exp_heap, o->heap_idx);
+{
+	struct object *o2;
+	o2 = binheap_root(exp_heap);
+	if (o2 != NULL)
+		assert(o2->ttl >= o->ttl);
+}
 		AZ(pthread_mutex_unlock(&exp_mtx));
 		VSL(SLT_ExpPick, 0, "%u", o->xid);