macvlan: handle set_promiscuity failures
It's quite unlikely that dev_set_promiscuity will fail, but worth checking just in case. Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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