PCI: designware: Remove redundant platform_get_resource() return value check

devm_ioremap_resource() fails gracefully when given a NULL resource
pointer, so we don't need to check separately for failure from
platform_get_resource_byname().  Remove the redundant check.

[bhelgaas: changelog]
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pcie-designware-plat.c

@@ -100,9 +100,6 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
 	pp->dev = &pdev->dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
 	dw_plat_pcie->mem_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(dw_plat_pcie->mem_base))
 		return PTR_ERR(dw_plat_pcie->mem_base);