* mi/mi-main.c (last_async_command): Rename to current_token.

    * mi/mi-main.c (last_async_command): Rename to current_token.
        (previous_async_command): Remove.
        (mi_cmd_gdb_exit): Adjust.
        (mi_cmd_exec_interrupt): Don't dance with previous_async_command.
        (mi_cmd_target_select): Adjust.
        (mi_cmd_execute): Don't set previous_async_command.  Free token
        here even in async mode.
        (mi_execute_async_cli_command): Adjust.
        (mi_exec_async_cli_cmd_continuation): Adjust.  Do not free the
        token.
        (mi_load_progress): Adjust.