usb: roles: Fix return value check in intel_xhci_usb_probe()

In case of error, the function devm_ioremap_nocache() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: f6fb9ec0 ("usb: roles: Add Intel xHCI USB role switch driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/roles/intel-xhci-usb-role-switch.c

@@ -145,8 +145,8 @@ static int intel_xhci_usb_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->base = devm_ioremap_nocache(dev, res->start, resource_size(res));
-	if (IS_ERR(data->base))
-		return PTR_ERR(data->base);
+	if (!data->base)
+		return -ENOMEM;
 
 	for (i = 0; i < ARRAY_SIZE(allow_userspace_ctrl_ids); i++)
 		if (acpi_dev_present(allow_userspace_ctrl_ids[i].hid, "1",