[dovecot/core] 483940: lib-smtp: Fix empty address parsing

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 483940da2d54dc156270676d1766a8319109515f
      https://github.com/dovecot/core/commit/483940da2d54dc156270676d1766a8319109515f
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2018-04-12 (Thu, 12 Apr 2018)

  Changed paths:
    M src/lib-smtp/smtp-address.c

  Log Message:
  -----------
  lib-smtp: Fix empty address parsing

sret wasn't initialized, which could have randomly caused "Path only
consists of source route" error with empty addresses. Broken by
81c8955e3d1475c6ab1892b1d3edf91126683fda