net: dsa: hellcreek: Don't print error message on defer

When DSA is not loaded when the driver is probed an error message is
printed. But, that's not really an error, just a defer. Use dev_err_probe()
instead.
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/hirschmann/hellcreek.c

@@ -1266,7 +1266,7 @@ static int hellcreek_probe(struct platform_device *pdev)
 
 	ret = dsa_register_switch(hellcreek->ds);
 	if (ret) {
-		dev_err(dev, "Unable to register switch\n");
+		dev_err_probe(dev, ret, "Unable to register switch\n");
 		return ret;
 	}