less restrictive checking for xfs quota stats
less restrictive checking for xfs quota stats

It seems that the xfs quota stats provided in /proc/fs/xfs/stats can
provide more than 8 values, so instead of erroring, just ignore the
extra fields.

Signed-off-by: Paul Gier <02c55f18a892b365bcd1802db9e5c9df39c04674@redhat.com>

prometheus/procfs,prometheus/procfs