[NETFILTER]: Remove IPv4 only connection tracking/NAT

Remove the obsolete IPv4 only connection tracking/NAT as scheduled in
feature-removal-schedule.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index 7ba341c..a668887 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -53,7 +53,7 @@
 	struct nf_conntrack_tuple t;
 	struct nf_ct_pptp_master *ct_pptp_info;
 	struct nf_nat_pptp *nat_pptp_info;
-	struct ip_nat_range range;
+	struct nf_nat_range range;
 
 	ct_pptp_info = &nfct_help(master)->help.ct_pptp_info;
 	nat_pptp_info = &nfct_nat(master)->help.nat_pptp_info;