*: fix more initialisers (for BSD)

FreeBSD and NetBSD spew a few more warnings about variable initialisers.
Found with OSR's/NetDEF's fancy new CI system.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index 33f802c..416a3e5 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -131,8 +131,8 @@
       void *object)
 {
   union sockunion *su;
-  union sockunion su_def = { .sin.sin_family = AF_INET,
-			     .sin.sin_addr.s_addr = INADDR_ANY };
+  union sockunion su_def = { .sin = { .sin_family = AF_INET,
+                                      .sin_addr.s_addr = INADDR_ANY } };
   struct peer_group *group;
   struct peer *peer;
   struct listnode *node, *nnode;
diff --git a/ripngd/ripngd.c b/ripngd/ripngd.c
index 82e3818..4c0b67d 100644
--- a/ripngd/ripngd.c
+++ b/ripngd/ripngd.c
@@ -1317,7 +1317,7 @@
   int sock;
   struct sockaddr_in6 from;
   struct ripng_packet *packet;
-  unsigned int ifindex;
+  unsigned int ifindex = 0;
   struct interface *ifp;
   int hoplimit = -1;
 
diff --git a/zebra/ioctl.c b/zebra/ioctl.c
index d783b0a..f7a7ff4 100644
--- a/zebra/ioctl.c
+++ b/zebra/ioctl.c
@@ -52,7 +52,7 @@
 {
   int sock;
   int ret;
-  int err;
+  int err = 0;
 
   if (zserv_privs.change(ZPRIVS_RAISE))
     zlog (NULL, LOG_ERR, "Can't raise privileges");
@@ -85,7 +85,7 @@
 {
   int sock;
   int ret;
-  int err;
+  int err = 0;
 
   if (zserv_privs.change(ZPRIVS_RAISE))
     zlog (NULL, LOG_ERR, "Can't raise privileges");