[dovecot/core] 1d1245: doveadm-mail: Handle parse_arg return value

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 1d12457b69c81eb520e0abe38ace5f49143cca0d
      https://github.com/dovecot/core/commit/1d12457b69c81eb520e0abe38ace5f49143cca0d
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2017-10-04 (Wed, 04 Oct 2017)

  Changed paths:
    M src/doveadm/doveadm-mail.c

  Log Message:
  -----------
  doveadm-mail: Handle parse_arg return value

Invalid parameters did not cause error.
Broken in fa6b2cbb3