Minor SSPI fixes
Minor SSPI fixes

When using NTLM, the payload sometimes does get encrypted, so preserve it.
And after DecryptMessage() don't free the buffer. It'll have been decrypted
in-place.

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

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