Fix issue of HDP select thread not exiting during BT OFF

    char sig_on = btif_hl_signal_select_exit;

    BTIF_TRACE_DEBUG0("btif_hl_signal_select_exit");

    result = send(signal_fds[1], &sig_on, sizeof(sig_on), 0);

    /* Wait for the select_thread_id to exit */

    if (btif_is_enabled())

    {

        /* Wait for the select_thread_id to exit if BT is still enabled

        and only this profile getting  cleaned up*/

        if (select_thread_id != -1) {

            pthread_join(select_thread_id, NULL);

            select_thread_id = -1;

        }

    }

   /* Cleanup signal sockets */

    if(signal_fds[0] != -1)

    {