[dovecot/core] 617862: lib-storage: Minor error message fix

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 61786203245e441635043dde7540e868a5532685
      https://github.com/dovecot/core/commit/61786203245e441635043dde7540e868a5532685
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-08-16 (Tue, 16 Aug 2016)

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

  Log Message:
  -----------
  lib-storage: Minor error message fix