ar71xx: ag71xx: Fix broken networking on some devices (FS#2177)

It was reported, that latest ar71xx builds have broken networking on
TP-Link TL-WPA8630 and Nanostation M5 XW devices and that by reverting
the offending commit, everything is back to normal.

Fixes: d3506d1 ("ar71xx: ag71xx: fix compile error when enabling debug")
Signed-off-by: Petr Štetiar <[email protected]>

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_phy.c

@@ -127,12 +127,13 @@ static int ag71xx_phy_connect_multi(struct ag71xx *ag)
 		if (ag->mii_bus->mdio_map[phy_addr] == NULL)
 			continue;
 
-		phydev = mdiobus_get_phy(ag->mii_bus, phy_addr);
-
 		DBG("%s: PHY found at %s, uid=%08x\n",
 		dev_name(dev),
 		dev_name(&ag->mii_bus->mdio_map[phy_addr]->dev),
 		(phydev) ? phydev->phy_id : 0);
+
+		if (phydev == NULL)
+			phydev = mdiobus_get_phy(ag->mii_bus, phy_addr);
 #endif
 	}