selftests: bpf: Skip write only files in debugfs
DebugFS for netdevsim now contains some "action trigger" files which are write only. Don't try to capture the contents of those. Note that we can't use os.access() because the script requires root. Fixes: 4418f862 ("netdevsim: implement support for devlink region and snapshots") Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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