X25: Move SYSCTL ifdefs into header

Moves the CONFIG_SYSCTL ifdefs in x25_init into header.

Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/x25.h b/include/net/x25.h
index 2cda040..9baa07d 100644
--- a/include/net/x25.h
+++ b/include/net/x25.h
@@ -287,8 +287,14 @@
 extern void x25_check_rbuf(struct sock *);
 
 /* sysctl_net_x25.c */
+#ifdef CONFIG_SYSCTL
 extern void x25_register_sysctl(void);
 extern void x25_unregister_sysctl(void);
+#else
+static inline void x25_register_sysctl(void) {};
+static inline void x25_unregister_sysctl(void) {};
+#endif /* CONFIG_SYSCTL */
+
 struct x25_skb_cb {
 	unsigned flags;
 };