ip_tunnel: fix possible rtable leak
ip_rt_put(rt) is always called in "error" branches above, but was missed in skb_cow_head branch. As rt is not yet bound to skb here we have to release it by hand. Signed-off-by: NDmitry Popov <ixaphire@qrator.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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