[dovecot/core] da61fd: lib: Fix compiler warning with non-Linux

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: da61fd89fa06b557c5955d70281fb20c0c0636b1
      https://github.com/dovecot/core/commit/da61fd89fa06b557c5955d70281fb20c0c0636b1
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-02-05 (Sun, 05 Feb 2017)

  Changed paths:
    M src/lib/nfs-workarounds.c

  Log Message:
  -----------
  lib: Fix compiler warning with non-Linux