net: phy: mdio-mux: slience probe defer error

If we fail to register the mdio bus due to probe defer, we should not
print an error message. Just be silent in this case.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-mux-mmioreg.c

@@ -163,8 +163,9 @@ static int mdio_mux_mmioreg_probe(struct platform_device *pdev)
 			    mdio_mux_mmioreg_switch_fn,
 			    &s->mux_handle, s, NULL);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to register mdio-mux bus %pOF\n",
-			np);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"failed to register mdio-mux bus %pOF\n", np);
 		return ret;
 	}