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Prevent Stream::read() from prematurely returning 0

Previously, it was possible for Stream::read() to return 0 in cases
where the underlying socket had not signalled EOF. This broke functions
such as read_exact(), which expects 0 to be returned only on EOF.

The bug occurred when only a partial TLS packet was available on the
underlying socket. This caused complete_io() to return successfully,
since it read some data, but failed to get more plaintext, since a
partial packet cannot be decoded.

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