http: Don't leak the auth form when handling <client-cert-request>
http: Don't leak the auth form when handling <client-cert-request>

Spotted by Coverity.

Signed-off-by: Kevin Cernekee <3105dbb3dd63fbb4f6371cfb04adc6726f76c56b@gmail.com>

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