[NETFILTER]: ctnetlink: fix compile failure with NF_CONNTRACK_MARK=n

  CC      net/netfilter/nf_conntrack_netlink.o
net/netfilter/nf_conntrack_netlink.c: In function 'ctnetlink_conntrack_event':
net/netfilter/nf_conntrack_netlink.c:392: error: 'struct nf_conn' has no member named 'mark'
make[3]: *** [net/netfilter/nf_conntrack_netlink.o] Error 1

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_conntrack_netlink.c

@@ -374,9 +374,11 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 		    && ctnetlink_dump_helpinfo(skb, ct) < 0)
 		    	goto nfattr_failure;
 
+#ifdef CONFIG_IP_NF_CONNTRACK_MARK
 		if ((events & IPCT_MARK || ct->mark)
 		    && ctnetlink_dump_mark(skb, ct) < 0)
 		    	goto nfattr_failure;
+#endif
 
 		if (events & IPCT_COUNTER_FILLING &&
 		    (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||

net/netfilter/nf_conntrack_netlink.c

@@ -389,9 +389,11 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 		    && ctnetlink_dump_helpinfo(skb, ct) < 0)
 		    	goto nfattr_failure;
 
+#ifdef CONFIG_NF_CONNTRACK_MARK
 		if ((events & IPCT_MARK || ct->mark)
 		    && ctnetlink_dump_mark(skb, ct) < 0)
 		    	goto nfattr_failure;
+#endif
 
 		if (events & IPCT_COUNTER_FILLING &&
 		    (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||