net: dsa: lan9303: Fix lan9303_detect_phy_setup() for MDIO
Handle that MDIO read with no response return 0xffff. Signed-off-by: NEgil Hjelmeland <privat@egil-hjelmeland.no> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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