Make dup_config_arg() always duplicate the argument
Make dup_config_arg() always duplicate the argument

.... even when conversion fails. Otherwise we end up trying to free a
member of argv[], which never works well.

Signed-off-by: David Woodhouse <97b3379caa91f4ee97e44013ae4dc6350540fa9d@infradead.org>

brandt/openconnect,mtmiller/openconnect,mtmiller/openconnect,cernekee/openconnect,mtmiller/openconnect,brandt/openconnect,cernekee/openconnect,brandt/openconnect,brandt/openconnect,cernekee/openconnect,cernekee/openconnect,mtmiller/openconnect