Comment 14 for bug 316607

The sed part isn't necessary. I only put it in for the sake of robustness against future updates/regressions to vol_id. In the past, 'vol_id -t /dev/null' used to report "/dev/null: unknown volume type". Now it does not mention the device that was probed, just the result "unknown or non-unique volume type (--probe-all lists possibly conflicting types)".