usb/ch9: use proper endianess for wBytesPerInterval

while going through Tatyana's changes for the gadget framework I noticed
that this type is not defined as __le16.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 500ec7a..a4fc4d9 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1130,7 +1130,7 @@
 		return 0;
 
 	if (udev->speed == USB_SPEED_SUPER)
-		return ep->ss_ep_comp.wBytesPerInterval;
+		return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval);
 
 	max_packet = GET_MAX_PACKET(le16_to_cpu(ep->desc.wMaxPacketSize));
 	max_burst = (le16_to_cpu(ep->desc.wMaxPacketSize) & 0x1800) >> 11;