firmware: imx: scu: use dev_err_probe

This simplifies the code and silences -517 error messages. Also
the reason is listed in /sys/kernel/debug/devices_deferred.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: tq-steina

drivers/firmware/imx/imx-scu.c

@@ -310,9 +310,8 @@ static int imx_scu_probe(struct platform_device *pdev)
 		sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
 		if (IS_ERR(sc_chan->ch)) {
 			ret = PTR_ERR(sc_chan->ch);
-			if (ret != -EPROBE_DEFER)
-				dev_err(dev, "Failed to request mbox chan %s ret %d\n",
-					chan_name, ret);
+			dev_err_probe(dev, ret, "Failed to request mbox chan %s\n",
+				      chan_name);
 			kfree(chan_name);
 			return ret;
 		}