[PATCH 2/3] BSD: don't complain about interfaces without IP addresses

[Vincent Bernat]

Without this patch, BIRD complains about interfaces without an IP
address:

    2019-08-12 07:41:26 <ERR> KIF: Invalid interface address 0.0.0.0 for vtnet2
---
 sysdep/bsd/krt-sock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c
index f0cebd11c5b7..f92cf1a68dc6 100644
--- a/sysdep/bsd/krt-sock.c
+++ b/sysdep/bsd/krt-sock.c
@@ -651,6 +651,8 @@ krt_read_addr(struct ks_msg *msg, int scan)
   imask = ipa_from_sa(&mask);
   ibrd  = ipa_from_sa(&brd);
 
+  if (ipa_zero(iaddr))
+    return;
 
   if ((masklen = ipa_masklen(imask)) < 0)
   {
-- 
2.23.0.rc1