Fix SSPI SOCKS auth crash on double-cleanup
Fix SSPI SOCKS auth crash on double-cleanup

Using the state for this is horrid; we should make it idempotent like
the GSSAPI one is.

Signed-off-by: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>

chadcatlett/openconnect,atyndall/openconnect,matlockx/openconnect,nmav/openconnect-mine,mtmiller/openconnect,nmav/openconnect-mine,atyndall/openconnect,chadcatlett/openconnect,don-johnny/openconnect,cernekee/openconnect,mtmiller/openconnect,atyndall/openconnect,cernekee/openconnect,cernekee/openconnect,atyndall/openconnect,lins05/openconnect,brandt/openconnect,mveplus/openconnect-client,nmav/openconnect-mine,brandt/openconnect,mveplus/openconnect-client,liiir1985/openconnect,matlockx/openconnect,liiir1985/openconnect,lins05/openconnect,lins05/openconnect,matlockx/openconnect,matlockx/openconnect,liiir1985/openconnect,mveplus/openconnect-client,don-johnny/openconnect,nmav/openconnect-mine,brandt/openconnect,mtmiller/openconnect,don-johnny/openconnect,lins05/openconnect,mveplus/openconnect-client,chadcatlett/openconnect,don-johnny/openconnect,brandt/openconnect,mtmiller/openconnect,chadcatlett/openconnect,liiir1985/openconnect,cernekee/openconnect