xhci: replace USB_MAXINTERFACES with config->desc.bNumInterface

This patch replaces USB_MAXINTERFACES with config->desc.bNumInterface in
the termination condition for the loop that updates the LPM timeout of the
endpoints on the cofiguration's interfaces, in xhci_calculate_lpm_timeout(),
to avoid unnecessary loop cycles since most configurations come with 1-2
interfaces while USB_MAXINTERFACES is 32.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci.c

@@ -4455,7 +4455,7 @@ static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd,
 	if (!config)
 		return timeout;
 
-	for (i = 0; i < USB_MAXINTERFACES; i++) {
+	for (i = 0; i < config->desc.bNumInterfaces; i++) {
 		struct usb_driver *driver;
 		struct usb_interface *intf = config->interface[i];