qemu range_init_nofail()

  /*
   * Initialize range to span the interval [lob,lob + size - 1].
   * size may be 0. Range must not overflow.
   */
  static inline void range_init_nofail(Range *range, uint64_t lob,
                                       uint64_t size)
  {
      range->lob = lob;
      range->upb = lob + size - 1;
  }