[conformal/btcd] 743869: Correct the addblock utility import.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 74386998be14102d2b158f2d93dfeaee67857130
      
https://github.com/conformal/btcd/commit/74386998be14102d2b158f2d93dfeaee67857130
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-08-11 (Mon, 11 Aug 2014)

  Changed paths:
    M util/addblock/import.go

  Log Message:
  -----------
  Correct the addblock utility import.

This commit corrects the check in the addblock utility to check each block
links the previous hash as intended versus the current block.

Fixes #162.