[dovecot/core] f41690: lib: use temp var in i_stream_unref for clarity

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: f4169072aebf5607b272f954fb405c838e1aa4d6
      https://github.com/dovecot/core/commit/f4169072aebf5607b272f954fb405c838e1aa4d6
  Author: Josef 'Jeff' Sipek <jeff.sipek at dovecot.fi>
  Date:   2017-11-09 (Thu, 09 Nov 2017)

  Changed paths:
    M src/lib/istream.c

  Log Message:
  -----------
  lib: use temp var in i_stream_unref for clarity