staging: mt7621-eth: fix return value check in mtk_connect_phy_node()

In case of error, the function of_phy_connect() returns NULL pointer not
ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.

Fixes: e3cbf478f846 ("staging: mt7621-eth: add the drivers core files")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-eth/mdio.c

@@ -82,10 +82,10 @@ int mtk_connect_phy_node(struct mtk_eth *eth, struct mtk_mac *mac,
 
 	phydev = of_phy_connect(eth->netdev[mac->id], phy_node,
 				mtk_phy_link_adjust, 0, phy_mode);
-	if (IS_ERR(phydev)) {
+	if (!phydev) {
 		dev_err(eth->dev, "could not connect to PHY\n");
 		eth->phy->phy_node[port] = NULL;
-		return PTR_ERR(phydev);
+		return -ENODEV;
 	}
 
 	phydev->supported &= PHY_GBIT_FEATURES;