[dovecot/core] 20a823: fs-posix: Fix iterating directories when readdir()...

[GitHub]

  Branch: refs/heads/master-2.3
  Home:   https://github.com/dovecot/core
  Commit: 20a8237da58deb4c7b88643a03388ae2e813df23
      https://github.com/dovecot/core/commit/20a8237da58deb4c7b88643a03388ae2e813df23
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2018-02-09 (Fri, 09 Feb 2018)

  Changed paths:
    M src/lib-fs/fs-posix.c

  Log Message:
  -----------
  fs-posix: Fix iterating directories when readdir() returns DT_UNKNOWN

Files were iterated correctly, but directories weren't. This mainly broke
directory iteration with NFS when nordirplus mount option was used.