patch for close connection bug

Hi all,

I noticed that if you shutdown the postmaster while you are connected to
it, if you try to close the connection (it throws an exception which is
expected) but if you call isClosed() on the connection afterwards it
still appears to be open as pg_stream is never set to null. The
following small patch fixes that.

Would be nice to have it in for beta of 7.3.

Cheers,

Tom.
-- 
Thomas O'Dowd. - Nooping - http://nooper.com
tom@xxxxxxxxxx - Testing - http://nooper.co.jp/labs

patch.txt
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