sasl_done - Dispose of a SASL connection object
       #include <sasl/sasl.h>
       void sasl_done( void );
       sasl_done  is  called  when the application is completely done with the
       SASL library.
       No return values
       RFC 2222
       sasl(3), sasl_server_init(3), sasl_client_init(3)