Set the 'must_close_session' flag at the end of close_session(), so
authorsimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Wed, 2 Mar 2011 18:52:03 +0000 (18:52 +0000)
committersimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Wed, 2 Mar 2011 18:52:03 +0000 (18:52 +0000)
that we won't keep calling close_session() again the next time we go
round the message loop. Should fix unclean-close-hang. Thanks to Simon
Coleman for debugging.

git-svn-id: svn://svn.tartarus.org/sgt/putty@9115 cda61777-01e9-0310-a592-d414129be87e


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