Werk #5708: df: Fix incorrect values being reported on devices with btrfs

Component Checks & agents
Title df: Fix incorrect values being reported on devices with btrfs
Date Jan 28, 2018
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.5.0i3
Level Prominent Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

This fixes a bug introduced with Werk #4806.

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