[IPV6] ROUTE: Make sure we have fn->leaf when adding a node on subtree.
Based on MIPL2 kernel patch. Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: NVille Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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