[NET]: Fix sparse warnings

Of this type, mostly:

CHECK   net/ipv6/netfilter.c
net/ipv6/netfilter.c:96:12: warning: symbol 'ipv6_netfilter_init' was not declared. Should it be static?
net/ipv6/netfilter.c:101:6: warning: symbol 'ipv6_netfilter_fini' was not declared. Should it be static?

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index a4208a3..14de4eb 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -295,4 +295,9 @@
 #endif
 }
 
+#ifdef CONFIG_PROC_FS
+extern int  fib_proc_init(void);
+extern void fib_proc_exit(void);
+#endif
+
 #endif  /* _NET_FIB_H */