ARM: DaVinci: EMAC: Fix phy_disconnect bug

Fix for phy_disconnect bug

Disconnect the phy device only if there is a PHY connected.
If the phy_mask is zero, the phydev pointer is null, therefore
check the phydevice before disconnection.
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

drivers/net/davinci_emac.c

@@ -2541,7 +2541,8 @@ static int emac_dev_stop(struct net_device *ndev)
 	emac_cleanup_rxch(priv, EMAC_DEF_RX_CH);
 	emac_write(EMAC_SOFTRESET, 1);
 
-	phy_disconnect(priv->phydev);
+	if (priv->phydev)
+		phy_disconnect(priv->phydev);
 
 	/* Free IRQ */
 	while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, i))) {