[conformal/btcdb] 2a688a: Update ldb tests for latest API error changes.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcdb
  Commit: 2a688a70b2aa4456fc8f01a03039a96fa4be2626
      
https://github.com/conformal/btcdb/commit/2a688a70b2aa4456fc8f01a03039a96fa4be2626
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-09-20 (Sat, 20 Sep 2014)

  Changed paths:
    M ldb/dup_test.go

  Log Message:
  -----------
  Update ldb tests for latest API error changes.