wusb: fix oops when terminating a non-existant reservation

If a reservation was not established, do not try terminating it.

Signed-off-by: David Vrabel <[e-mail]>

drivers/usb/wusbcore/reservation.c

···
  */
 void wusbhc_rsv_terminate(struct wusbhc *wusbhc)
 {
-	uwb_rsv_terminate(wusbhc->rsv);
-	uwb_rsv_destroy(wusbhc->rsv);
+	if (wusbhc->rsv) {
+		uwb_rsv_terminate(wusbhc->rsv);
+		uwb_rsv_destroy(wusbhc->rsv);
+		wusbhc->rsv = NULL;
+	}
 }