net: stmmac: Move device_can_wakeup() check earlier in set_wol
If !device_can_wakeup(), there's no need to futher check. And return -EOPNOTSUPP rather than -EINVAL if !device_can_wakeup(). Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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