[NETFILTER]: PPTP helper: fix sstate/cstate typo

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/ip_conntrack_helper_pptp.c b/net/ipv4/netfilter/ip_conntrack_helper_pptp.c
index 7d3ba43..8ccfe17 100644
--- a/net/ipv4/netfilter/ip_conntrack_helper_pptp.c
+++ b/net/ipv4/netfilter/ip_conntrack_helper_pptp.c
@@ -469,8 +469,8 @@
 			DEBUGP("%s but no session\n", pptp_msg_name[msg]);
 			break;
 		}
-		if (info->sstate != PPTP_CALL_IN_REP
-		    && info->sstate != PPTP_CALL_IN_CONF) {
+		if (info->cstate != PPTP_CALL_IN_REP
+		    && info->cstate != PPTP_CALL_IN_CONF) {
 			DEBUGP("%s but never sent IN_CALL_REPLY\n",
 				pptp_msg_name[msg]);
 			break;