stream_input: avoid IO#close on client disconnect

This can avoid IOError from being seen by the application, and also
reduces points where IO#close may be called.  This is a good thing
if we eventually port this code into a low-level server like
cmogstored where per-client memory space is defined by FD number of
a client.

Reported-by: Andrew Hobson <ahobson@gmail.com>

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