[project @ robey@lag.net-20071110065222-xt335qy6c4s6flze]

patch from james bardin to allow closing an SSHClient more than once. :)

paramiko/client.py

@@ -294,6 +294,8 @@ class SSHClient (object):
         """
         Close this SSHClient and its underlying L{Transport}.
         """
+        if self._transport is None:
+            return
         self._transport.close()
         self._transport = None