[btcsuite/btcd] 7de7bd: peer: use atomics instead of mutexes (#670)

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 7de7bddba9d9a8b0b7490931e346e8f10d0bdb7f
      
https://github.com/btcsuite/btcd/commit/7de7bddba9d9a8b0b7490931e346e8f10d0bdb7f
  Author: David Hill <dh...@mindcry.org>
  Date:   2016-06-20 (Mon, 20 Jun 2016)

  Changed paths:
    M peer/peer.go

  Log Message:
  -----------
  peer: use atomics instead of mutexes (#670)