[dovecot/core] f769a2: doveadm: Fix compiler warning

[GitHub]

  Branch: refs/heads/master-2.3
  Home:   https://github.com/dovecot/core
  Commit: f769a22d4ba845acff70a57b056fb9a6a9d05599
      https://github.com/dovecot/core/commit/f769a22d4ba845acff70a57b056fb9a6a9d05599
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2018-06-08 (Fri, 08 Jun 2018)

  Changed paths:
    M src/doveadm/client-connection-tcp.c

  Log Message:
  -----------
  doveadm: Fix compiler warning



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