Suggested improvement for virtq_need_event

[Olivier Delande <olivier.delande@gmail.com>]

In virtio_queue.h, virtq_need_event is implemented as

  static inline int virtq_need_event(uint16_t event_idx, uint16_t
new_idx, uint16_t old_idx)
  {
      return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx
- old_idx);
  }

. Wouldn't the equivalent

  static inline int virtq_need_event(uint16_t event_idx, uint16_t
new_idx, uint16_t old_idx)
  {
      return (uint16_t)(event_idx - old_idx) < (uint16_t)(new_idx - old_idx);
  }

be more readable/intuitive (and possibly slightly faster and more compact)?

Apologies for bikeshedding!