stalld: Skip get_cpu_idle_time() warning for offline cpus

Fernando Pachecorequested to merge
pachecof/stalld:skip-offline into main

Statistics for offline cpus do not appear in /proc/stat. For systems with several offline cpus we end up spamming warn messages when attempting to get the idle time from said file. Use -ENODEV to indicate the cpu might be offline and skip the warn().

Signed-off-by: Fernando Pacheco fpacheco@redhat.com

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