netdevsim: make debug dirs' dentries static
The root directories of netdevsim should only be used by the core to create per-device subdirectories, so limit their visibility to the core file. Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: NQuentin Monnet <quentin.monnet@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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