add comment on sanity check

diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index e1e60e6..30f7120 100644 (file)
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: nd6.c,v 1.9 2000/04/13 14:34:10 itojun Exp $  */
+/*     $OpenBSD: nd6.c,v 1.10 2000/04/13 16:27:26 itojun Exp $ */
 /*     $KAME: nd6.c,v 1.41 2000/02/24 16:34:50 itojun Exp $    */
 
 /*
@@ -1859,6 +1859,7 @@ nd6_storelladdr(ifp, rt, m, dst, desten)
        }
        sdl = SDL(rt->rt_gateway);
        if (sdl->sdl_alen == 0) {
+               /* this should be impossible, but we bark here for debugging */
                printf("nd6_storelladdr: sdl_alen == 0\n");
                return(0);
        }