It used to be that bus->irq was a pointer but after 
e7f4dc3536a4
('mdio: Move allocation of interrupts into core') it's an array inside
the mdio struct, so it can never be NULL.  Let's remove the check.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
        dev->phy_id = phy_id;
        if (c45_ids)
                dev->c45_ids = *c45_ids;
-       dev->irq = bus->irq ? bus->irq[addr] : PHY_POLL;
+       dev->irq = bus->irq[addr];
        dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
 
        dev->state = PHY_DOWN;