ospf6d: fix crash when removing router from vrf that doesn't exist

`listgetdata(listhead(list))` crashes for an empty list.

Reproducible with:
```
router ospf6 vrf doesntexist
 default-information originate always
 exit
no router ospf6 vrf doesntexist
```

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

diff --git a/ospf6d/ospf6_asbr.c b/ospf6d/ospf6_asbr.c
index 6981baba99d1a18e1222a1e62b66442e7509cdee..ccab39481ef16ca28aa5301e4f5433874cb3a921 100644 (file)
--- a/ospf6d/ospf6_asbr.c
+++ b/ospf6d/ospf6_asbr.c
@@ -579,7 +579,7 @@ void ospf6_asbr_lsa_remove(struct ospf6_lsa *lsa,
        if (ospf6_is_router_abr(ospf6))
                oa = ospf6->backbone;
        else
-               oa = listgetdata(listhead(ospf6->area_list));
+               oa = listnode_head(ospf6->area_list);
 
        if (oa == NULL)
                return;