mailbox: arm_mhu: Remove redundant error printing in mhu_probe()

When devm_ioremap_resource() fails, a clear enough error message will be
printed by its subfunction __devm_ioremap_resource(). The error
information contains the device name, failure cause, and possibly resource
information.

Therefore, remove the error printing here to simplify code and reduce the
binary size.

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Zhen Lei <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/arm_mhu.c

···
 		return -ENOMEM;
 
 	mhu->base = devm_ioremap_resource(dev, &adev->res);
-	if (IS_ERR(mhu->base)) {
-		dev_err(dev, "ioremap failed\n");
+	if (IS_ERR(mhu->base))
 		return PTR_ERR(mhu->base);
-	}
 
 	for (i = 0; i < MHU_CHANS; i++) {
 		mhu->chan[i].con_priv = &mhu->mlink[i];