net: switchdev: add SET_SWITCHDEV_OPS helper
Add a helper to allow switchdev ops to be set if NET_SWITCHDEV is configured and do nothing otherwise. This allows for slightly cleaner code which uses switchdev but does not select NET_SWITCHDEV. Signed-off-by: NSimon Horman <simon.horman@netronome.com> Acked-by: NIvan Vecera <ivecera@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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