[conformal/btcwallet] e1ce98: Add missing mutex unlock if an error is hit.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwallet
  Commit: e1ce9843bf0669acd3caa5227577309278d3dbb0
      
https://github.com/conformal/btcwallet/commit/e1ce9843bf0669acd3caa5227577309278d3dbb0
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2013-11-21 (Thu, 21 Nov 2013)

  Changed paths:
    M sockets.go

  Log Message:
  -----------
  Add missing mutex unlock if an error is hit.

Spotted by dhill.