[NETFILTER] remove unneeded structure definition from conntrack helper

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter_ipv4/ip_conntrack_pptp.h

@@ -284,13 +284,6 @@ struct PptpSetLinkInfo {
 	__be32	recvAccm;
 };
 
-
-struct pptp_priv_data {
-	__u16	call_id;
-	__u16	mcall_id;
-	__u16	pcall_id;
-};
-
 union pptp_ctrl_union {
 		struct PptpStartSessionRequest	sreq;
 		struct PptpStartSessionReply	srep;