[conformal/btcchain] acdce2: Defer unlock of orphan mutex in addOrphanBlock.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcchain
  Commit: acdce27f9f6b9c275af9c1b6f8ab762b20adf335
      
https://github.com/conformal/btcchain/commit/acdce27f9f6b9c275af9c1b6f8ab762b20adf335
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-03-09 (Sun, 09 Mar 2014)

  Changed paths:
    M chain.go

  Log Message:
  -----------
  Defer unlock of orphan mutex in addOrphanBlock.

This was pointed out by saracen on the btcd IRC channel.