[conformal/btcutil] c64741: Add PEM encode error checking

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcutil
  Commit: c64741f9030383bc94961faea825d183ac0866e0
      
https://github.com/conformal/btcutil/commit/c64741f9030383bc94961faea825d183ac0866e0
  Author: David Hill <dh...@mindcry.org>
  Date:   2014-12-13 (Sat, 13 Dec 2014)

  Changed paths:
    M certgen.go
    M test_coverage.txt

  Log Message:
  -----------
  Add PEM encode error checking