netfilter: ctnetlink: use nf_conntrack_get instead of atomic_inc

Use nf_conntrack_get instead of the direct call to atomic_inc.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/netfilter/nf_conntrack_netlink.c

@@ -1209,7 +1209,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
 				goto out_unlock;
 			}
 			master_ct = nf_ct_tuplehash_to_ctrack(master_h);
-			atomic_inc(&master_ct->ct_general.use);
+			nf_conntrack_get(&master_ct->ct_general);
 		}
 
 		spin_unlock_bh(&nf_conntrack_lock);