mailbox: bcm2835: Remove redundant dev_err call in bcm2835_mbox_probe()

There is a error message within devm_ioremap_resource
already, so remove the dev_err call to avoid redundant
error message.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/bcm2835-mailbox.c

@@ -157,7 +157,6 @@ static int bcm2835_mbox_probe(struct platform_device *pdev)
 	mbox->regs = devm_ioremap_resource(&pdev->dev, iomem);
 	if (IS_ERR(mbox->regs)) {
 		ret = PTR_ERR(mbox->regs);
-		dev_err(&pdev->dev, "Failed to remap mailbox regs: %d\n", ret);
 		return ret;
 	}