Dan's static checker caught a potential code path in phy_state_machine() where
we were not checking phydev->drv which is in phy_aneg_done().
Reported-by: Dan Carpenter <redacted>
Fixes: 25149ef9d25c ("net: phy: Check phydev->drv")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>