DPP: Remove dpp-listen radio work when stopping

The radio work starting may be delayed. If the DPP listen operation is
stopped before the radio work starts, the pending dpp-listen radio work
won't get cleaned up, which might lead to failing to start the next DPP
listen operation.

Issue scenario: DPP start -> dpp-listen radio work added but not started
-> DPP stop, pending radio work not cleaned up -> radio work start ->
trying to start DPP but failing because a dpp-listen work already
exists.

This commit removes the potential pending dpp-listen radio
work when DPP stops.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>

wpa_supplicant/dpp_supplicant.c

@@ -1021,6 +1021,7 @@ void wpas_dpp_listen_stop(struct wpa_supplicant *wpa_s)
 	wpa_drv_dpp_listen(wpa_s, false);
 	wpa_s->dpp_listen_freq = 0;
 	wpas_dpp_listen_work_done(wpa_s);
+	radio_remove_works(wpa_s, "dpp-listen", 0);
 }