net: phy: do not print dump stack if device was removed

In case phy_state_machine() works on top of USB device, we can get -ENODEV
at any point. So, be less noisy if device was removed.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy.c

@@ -1136,6 +1136,9 @@ void phy_state_machine(struct work_struct *work)
 	else if (do_suspend)
 		phy_suspend(phydev);
 
+	if (err == -ENODEV)
+		return;
+
 	if (err < 0)
 		phy_error(phydev);