PCI: rcar: Verify that mem_res is 64K-aligned

The lower 16 bits of the address, which is managed by mem_res, need to be
zero. Check the address to verify this.

Signed-off-by: Nobuhiro Iwamatsu <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Acked-by: Simon Horman <[e-mail]>

drivers/pci/host/pci-rcar-gen2.c

···
 	if (!mem_res || !mem_res->start)
 		return -ENODEV;
 
+	if (mem_res->start & 0xFFFF)
+		return -EINVAL;
+
 	priv = devm_kzalloc(&pdev->dev,
 			    sizeof(struct rcar_pci_priv), GFP_KERNEL);
 	if (!priv)