phy: remove an unneeded condition

It used to be that bus->irq was a pointer but after e7f4dc35
('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: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/phy_device.c

@@ -340,7 +340,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 	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;