net: stmmac: reduce indentation when calling stmmac_xpcs_setup

There is no reason to embed an if within an if, we can just logically
AND the two conditions.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Wong Vee Khee <vee.khee.wong@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -7003,12 +7003,10 @@ int stmmac_dvr_probe(struct device *device,
 	if (priv->plat->speed_mode_2500)
 		priv->plat->speed_mode_2500(ndev, priv->plat->bsp_priv);
 
-	if (priv->plat->mdio_bus_data) {
-		if (priv->plat->mdio_bus_data->has_xpcs) {
-			ret = stmmac_xpcs_setup(priv->mii);
-			if (ret)
-				goto error_xpcs_setup;
-		}
+	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
+		ret = stmmac_xpcs_setup(priv->mii);
+		if (ret)
+			goto error_xpcs_setup;
 	}
 
 	ret = stmmac_phy_setup(priv);