net/ethtool/ioctl: return -EOPNOTSUPP if we have no phy stats
It's not very useful to copy back an empty ethtool_stats struct and return 0 if we didn't actually have any stats. This also allows for further simplification of this function in the future commits. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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