[IPV6] ROUTE: Prune clones from main tree as well.

Based on MIPL2 kernel patch.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 11f9660..35b91ff 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -776,7 +776,7 @@
 	if (err == 0) {
 		fib6_start_gc(rt);
 		if (!(rt->rt6i_flags&RTF_CACHE))
-			fib6_prune_clones(fn, rt);
+			fib6_prune_clones(pn, rt);
 	}
 
 out: