Skip over potential error messages from "df"
Review Request #103633 - Created Jan. 5, 2012 and submitted
As seen in bug 289671, "kdf" aborts (crashes) when the "df" output does not start with "Filesystem". The error message from gvfs is marked as WONTFIX in upstream bug trackers, so we have to deal with those messages. The proposed patch skips any leading messages, and only aborts when no "Filesystem" string could be found.