[RXRPC]: Fix build with SYSCTL=n

Signed-off-by: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: David S. Miller <davem@redhat.com>

include/rxrpc/rxrpc.h

@@ -16,10 +16,17 @@
 
 extern uint32_t rxrpc_epoch;
 
+#ifdef CONFIG_SYSCTL
 extern int rxrpc_ktrace;
 extern int rxrpc_kdebug;
 extern int rxrpc_kproto;
 extern int rxrpc_knet;
+#else
+#define rxrpc_ktrace	0
+#define rxrpc_kdebug	0
+#define rxrpc_kproto	0
+#define rxrpc_knet	0
+#endif
 
 extern int rxrpc_sysctl_init(void);
 extern void rxrpc_sysctl_cleanup(void);