shin 4338629a91 fix kernel panic at rtfree() in INET6 enabled envrionment.
This is probably due to twice rtfree() in in6_pcbdetach(),
  one for inp->in6p_route.ro_rt, and another one for inp->inp_route.ro_rt.
  But these 2 are actually shared in inpcb, so 2nd rtfree() is not necessary.
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