[PATCH][USB] xhci: replace if-elseif-else with switch-case

[Viral Mehta <viral.mehta@xxxxxxxxxxxxxx>]

Replace if-elseif-else with switch-case
to keep the code consistent which is semantically same

Switch-case is used here,
http://www.spinics.net/lists/linux-usb/msg17201.html
Making consistent at other places in usb/core

Also easier to read and maintain when USB4.0, 5.0, ... comes

CC: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Signed-off-by: Viral Mehta <viral.mehta@xxxxxxxxxxxxxx>
---
This can be applied on top of xhci patches.
It is against git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci.git

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2870735..f94c110 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -488,28 +488,39 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
	case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
		switch (wValue & 0xff00) {
		case USB_DT_DEVICE << 8:
-			if (hcd->driver->flags & HCD_USB3)
+			switch (hcd->driver->flags & HCD_MASK) {
+			case HCD_USB3:
				bufp = usb3_rh_dev_descriptor;
-			else if (hcd->driver->flags & HCD_USB2)
+				break;
+			case HCD_USB2:
				bufp = usb2_rh_dev_descriptor;
-			else if (hcd->driver->flags & HCD_USB11)
+				break;
+			case HCD_USB11:
				bufp = usb11_rh_dev_descriptor;
-			else
+				break;
+			default:
				goto error;
+			}
			len = 18;
			if (hcd->has_tt)
				patch_protocol = 1;
			break;
		case USB_DT_CONFIG << 8:
-			if (hcd->driver->flags & HCD_USB3) {
+			switch (hcd->driver->flags & HCD_MASK) {
+			case HCD_USB3:
				bufp = ss_rh_config_descriptor;
				len = sizeof ss_rh_config_descriptor;
-			} else if (hcd->driver->flags & HCD_USB2) {
+				break;
+			case HCD_USB2:
				bufp = hs_rh_config_descriptor;
				len = sizeof hs_rh_config_descriptor;
-			} else {
+				break;
+			case HCD_USB11:
				bufp = fs_rh_config_descriptor;
				len = sizeof fs_rh_config_descriptor;
+				break;
+			default:
+				goto error;
			}
			if (device_can_wakeup(&hcd->self.root_hub->dev))
				patch_wakeup = 1;
--
1.5.6.5
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