BUG#9814: post-review fixes: clear thd->net.no_send error after SP instruction

      items made during other permanent subquery transformations).

    */

    thd->current_arena= i;

    ret= i->execute(thd, &ip);

    /*

      no_send_error may have been set by the previous SP instruction when it

      sent eof. Allow the current SP instruction to produce an error.

      (multi-statement execution code clears no_send_error, too)

      If this SP instruction have sent eof, it has caused no_send_error to be

      set. Clear it back to allow the next instruction to send error. (multi-

      statement execution code clears no_send_error between statements too)

    */

    thd->net.no_send_error= 0;

    ret= i->execute(thd, &ip);

    if (i->free_list)

      cleanup_items(i->free_list);

    i->state= Query_arena::EXECUTED;