[dovecot/core] 1ada45: lib-dcrypt: Always allow error_r to be NULL.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 1ada45cd38aa503efa088a90ee240356f1ea7d3b
      https://github.com/dovecot/core/commit/1ada45cd38aa503efa088a90ee240356f1ea7d3b
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-05-30 (Mon, 30 May 2016)

  Changed paths:
    M src/lib-dcrypt/dcrypt-openssl.c

  Log Message:
  -----------
  lib-dcrypt: Always allow error_r to be NULL.

Especially dcrypt_openssl_private_to_public_key() was called with
error_r=NULL by the dcrypt.c itself.