Guard ksystemstats_intel_helper against path traversal

Fabian Vogtrequested to merge
work/fvogt/boo1262779 into master

Reject any slashes in the given argument.

Authored-by: Matthias Gerstner matthias.gerstner@suse.com

Requested by the downstream security team during review: https://bugzilla.opensuse.org/show_bug.cgi?id=1262779#c10

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