Fix AsyncSliceQueue #22
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The for-loop in AsyncSliceQueue::new pushes only
max_slices_buffers_count-1vectors to the chunks buffers pool. This is a problem at least whenmax_slices_buffers_countis 1, which is the case when the number of threads is 1, in which case nothing is pushed. The function add_data will then get stuck in the inner loop, becauseself.chunks_buffers_pool.1.try_recv()always fails because there is nothing in the pool.