Code review challenge – The concurrent dictionary refactoring

In a recent code review, I had modified the following code:

_freeSegments.AddOrUpdate(memoryDataForPointer.SizeInBytes, x =>
{
   var newQueue = new ConcurrentQueue<AllocatedMemoryData>>();
   newQueue.Enqueue(memoryDataForPointer);
   return newQueue;
}, (x, queue) =>
{
   queue.Enqueue(memoryDataForPointer);
   return queue;
});

Into this code:

var q = _freeSegments.GetOrAdd(memoryDataForPointer.SizeInBytes, 
                         size => new ConcurrentQueue<AllocatedMemoryData>());
q.Enqueue(memoryDataForPointer);

Can you tell me why?

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