[conformal/btcd] f843c1: in Valid() ensure that na.IP is set. Found by drah...

[Owain G. Ainsworth]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: f843c141aee22890ffce18971a2e8c7f299d660b
      
https://github.com/conformal/btcd/commit/f843c141aee22890ffce18971a2e8c7f299d660b
  Author: Owain G. Ainsworth <o...@conformal.com>
  Date:   2013-11-22 (Fri, 22 Nov 2013)

  Changed paths:
    M addrmanager.go

  Log Message:
  -----------
  in Valid() ensure that na.IP is set. Found by drahn.