usb: bdc: remove duplicated error message

in case devm_platform_ioremap_resource() fails, that function already
prints a relevant error message which renders the driver's dev_err()
redundant. Let's remove the unnecessary message and, while at that,
also make sure to pass along the error value returned by
devm_platform_ioremap_resource() instead of always returning -ENOMEM.
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>

[balbi@kernel.org : improved commit log]
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/gadget/udc/bdc/bdc_core.c

@@ -510,10 +510,9 @@ static int bdc_probe(struct platform_device *pdev)
 	bdc->clk = clk;
 
 	bdc->regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(bdc->regs)) {
-		dev_err(dev, "ioremap error\n");
-		return -ENOMEM;
-	}
+	if (IS_ERR(bdc->regs))
+		return PTR_ERR(bdc->regs);
+
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;