[conformal/btcec] de670b: check for 0 length strings in pubkey parser.

[Owain G. Ainsworth]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcec
  Commit: de670bd5b2b1dff06b09d4e0b7b6bcb6f5cce93a
      
https://github.com/conformal/btcec/commit/de670bd5b2b1dff06b09d4e0b7b6bcb6f5cce93a
  Author: Owain G. Ainsworth <o...@conformal.com>
  Date:   2014-03-17 (Mon, 17 Mar 2014)

  Changed paths:
    M pubkey.go

  Log Message:
  -----------
  check for 0 length strings in pubkey parser.

We check length later, but we assumed it was always 1 bytes long. Not
always the case. I'm a little depressed that this bug was there.