code: func (c *linkAddrCache) removeWaker(k tcpip.FullAddress, waker *sleep.Waker) {
  	c.mu.Lock()
  	defer c.mu.Unlock()
  
  	if entry, ok := c.cache[k]; ok {
  		entry.removeWaker(waker)
  	}
  }
docs: // removeWaker removes a waker previously added through get().