net: dpaa: fix maybe uninitialized var in dpaa_open()

Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c

@@ -2468,7 +2468,8 @@ static int dpaa_open(struct net_device *net_dev)
 	mac_dev = priv->mac_dev;
 	dpaa_eth_napi_enable(priv);
 
-	if (dpaa_phy_init(net_dev))
+	err = dpaa_phy_init(net_dev);
+	if (err)
 		goto phy_init_failed;
 
 	for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {