[dovecot/core] e2fd3f: lib-storage: Allow mail_storage_set_error() to use...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: e2fd3f13fff682498ad58fec7c11f20f9890c657
      https://github.com/dovecot/core/commit/e2fd3f13fff682498ad58fec7c11f20f9890c657
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-02-23 (Thu, 23 Feb 2017)

  Changed paths:
    M src/lib-storage/mail-storage.c

  Log Message:
  -----------
  lib-storage: Allow mail_storage_set_error() to use existing error_string

Fixes some code that may be attempting to copy an error from one storage to
another, but actually ends up trying to copy within the same storage.