Destroy vpninfo->https_cred on failing to create it
Destroy vpninfo->https_cred on failing to create it

If something like certificate setup went wrong, we'd return failure but
*not* destroy the gnutls_certificate_credentials_t that we were
attempting to set up. So a subsequent retry would see that it already
exists, assume it's *fine* and just go ahead and use it. Don't do that.

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

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