[btcsuite/btcwallet] a735e3: Add mutex for delete(m.addrs, ..) in MarkUsed

[Alex Yocom-Piatt]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcwallet
  Commit: a735e3c3e25c0dbe5ee886e38eb78e2511c71fba
      
https://github.com/btcsuite/btcwallet/commit/a735e3c3e25c0dbe5ee886e38eb78e2511c71fba
  Author: Alex Yocom-Piatt <a...@conformal.com>
  Date:   2015-06-15 (Mon, 15 Jun 2015)

  Changed paths:
    M waddrmgr/manager.go

  Log Message:
  -----------
  Add mutex for delete(m.addrs, ..) in MarkUsed