Fix potential panic in linux disk IO counters
Old kernels have a bug in diskstats where lines can have less than 14 fields. This applies to the kernel present in RHEL 5.2 and earlier. It's a bit of a niche but probably best to patch to be safe from future bugs too. RHEL bug case: https://bugzilla.redhat.com/show_bug.cgi?id=583285 Encountered in Telegraf: https://github.com/influxdata/telegraf/issues/1322
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