netfilter: netns nf_conntrack: pass netns pointer to L4 protocol's ->error hook

Again, it's deducible from skb, but we're going to use it for
nf_conntrack_checksum and statistics, so just pass it from upper layer.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
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 edc3035..6ead8da 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -545,9 +545,9 @@
 	return NF_ACCEPT;
 }
 
-static int dccp_error(struct sk_buff *skb, unsigned int dataoff,
-		      enum ip_conntrack_info *ctinfo, u_int8_t pf,
-		      unsigned int hooknum)
+static int dccp_error(struct net *net, struct sk_buff *skb,
+		      unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+		      u_int8_t pf, unsigned int hooknum)
 {
 	struct dccp_hdr _dh, *dh;
 	unsigned int dccp_len = skb->len - dataoff;