netfilter: nf_ct_dccp/udplite: fix protocol registration error

Commit d0dba725 (netfilter: ctnetlink: add callbacks to the per-proto
nlattrs) changed the protocol registration function to abort if the
to-be registered protocol doesn't provide a new callback function.

The DCCP and UDP-Lite IPv6 protocols were missed in this conversion,
add the required callback pointer.

Reported-and-tested-by: Steven Jan Springl <steven@springl.ukfsn.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 50dac8db..5411d63 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -777,6 +777,7 @@
 	.print_conntrack	= dccp_print_conntrack,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
 	.to_nlattr		= dccp_to_nlattr,
+	.nlattr_size		= dccp_nlattr_size,
 	.from_nlattr		= nlattr_to_dccp,
 	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
 	.nlattr_tuple_size	= nf_ct_port_nlattr_tuple_size,