Fix typo in error message
Fix typo in error message

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

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