[dovecot/core] 9a8217: lib-storage: Fix crash in obox's dsync-merge

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 9a8217a728581b4787ab65eb6d1b06681945803d
      https://github.com/dovecot/core/commit/9a8217a728581b4787ab65eb6d1b06681945803d
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-12-14 (Wed, 14 Dec 2016)

  Changed paths:
    M src/lib-storage/list/mailbox-list-index-backend.c

  Log Message:
  -----------
  lib-storage: Fix crash in obox's dsync-merge