[dovecot/core] fb6734: dict-sql: Fix flushing

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: fb6734cf234cb513864c27a1936958a26a45aa6c
      https://github.com/dovecot/core/commit/fb6734cf234cb513864c27a1936958a26a45aa6c
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2017-01-16 (Mon, 16 Jan 2017)

  Changed paths:
    M src/lib-dict/dict-sql.c

  Log Message:
  -----------
  dict-sql: Fix flushing

Remove flushing from set, and add it to unset. Fixes
signal 11 crash caused by infinite recursion.