Clear ro->ro_rt just after RTFREE().   Pleases let me make sure that no one touch the invalid ro_rt pointer,   after splx(s) and before next ro_rt initialization.   Though usually this seems to be already called at splnet,   I still sometime experience kernel crash at rtfree() in my   INET6 enabled environment where IPv6 connection is frequently used.   (Off-course, it might be just due to another bug.)
Clear ro->ro_rt just after RTFREE().
  Pleases let me make sure that no one touch the invalid ro_rt pointer,
  after splx(s) and before next ro_rt initialization.
  Though usually this seems to be already called at splnet,
  I still sometime experience kernel crash at rtfree() in my
  INET6 enabled environment where IPv6 connection is frequently used.
  (Off-course, it might be just due to another bug.)

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