[chunkwriting] Return original buffer to the pool #284
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When the buffer isn't filled to capacity a new slice is created that's
smaller than the original. In that case the smaller slice is returned to
the pool which prevents the rest of the capacity from being used again.
The solution is to pass the original slice through and attach the
length. This allows the original slice to be returned to the pool once
the operation is complete.
This change also simplifies the
sendChunk
method, ensuring that thebuffer is returned to the TransferManager even when no bytes were read
from the reader.