[NETLINK]: Missing initializations in dumped data

Mostly missing initialization of padding fields of 1 or 2 bytes length,
two instances of uninitialized nlmsgerr->msg of 16 bytes length.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a54d4ef..8140bed 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2923,6 +2923,7 @@
 	nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
 	r = NLMSG_DATA(nlh);
 	r->ifi_family = AF_INET6;
+	r->__ifi_pad = 0;
 	r->ifi_type = dev->type;
 	r->ifi_index = dev->ifindex;
 	r->ifi_flags = dev_get_flags(dev);