[NETFILTER]: nf_conntrack: don't use nfct in skb if conntrack is disabled

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 70d3b4f..4777f1b 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -281,9 +281,6 @@
 			struct nf_info *info,
 			unsigned int verdict);
 
-extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *);
-extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
-
 /* FIXME: Before cache is ever used, this must be implemented for real. */
 extern void nf_invalidate_cache(int pf);
 
@@ -388,11 +385,17 @@
 {
 	return 1;
 }
-static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
 struct flowi;
 static inline void
 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) {}
 #endif /*CONFIG_NETFILTER*/
 
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *);
+extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
+#else
+static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
+#endif
+
 #endif /*__KERNEL__*/
 #endif /*__LINUX_NETFILTER_H*/