[dovecot/core] 85b414: lib-master: don't leak config path

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 85b4143f07c504294dd4e5b168e9bfb293515c31
      https://github.com/dovecot/core/commit/85b4143f07c504294dd4e5b168e9bfb293515c31
  Author: Josef 'Jeff' Sipek <jeffpc at josefsipek.net>
  Date:   2016-08-24 (Wed, 24 Aug 2016)

  Changed paths:
    M src/lib-master/master-service.c

  Log Message:
  -----------
  lib-master: don't leak config path

The config path can already be non-NULL thanks to the default config path
code or the CONFIG_PATH environmental variable.