net: phy: unlock on error in phy_probe()

If genphy_c45_read_eee_adv() fails then we need to do a reset and unlock
the &phydev->lock mutex before returning.

Fixes: 3eeca4e1

 ("net: phy: do not force EEE support")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/Y/x/6kHCjnQHqOpF@kili


Signed-off-by: Paolo Abeni <pabeni@redhat.com>