D5800: Fix filesytem type detection on FreeBSD

[Christoph Feck]

cfeck accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R356 KDiskFree

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5800

To: tcberner, #freebsd, laissus, cfeck
Cc: kde-utils-devel
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