net: phy: fix phy_start to consider PHY_IGNORE_INTERRUPT

This condition wasn't adjusted when PHY_IGNORE_INTERRUPT (-2) was added
long ago. In case of PHY_IGNORE_INTERRUPT the MAC interrupt indicates
also PHY state changes and we should do what the symbol says.

Fixes: 84a527a41f38 ("net: phylib: fix interrupts re-enablement in phy_start")
Signed-off-by: Heiner Kallweit <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/phy.c

···
 		phy_resume(phydev);
 
 		/* make sure interrupts are re-enabled for the PHY */
-		if (phydev->irq != PHY_POLL) {
+		if (phy_interrupt_is_valid(phydev)) {
 			err = phy_enable_interrupts(phydev);
 			if (err < 0)
 				break;