bgscan_learn: Fix initial interval

In case the initial signal level of the associated BSS was above the
given threshold, bgscan_learn module would begin using the
short_interval but never switch to the long_interval as there would be
no signal change event. Make the init code poll for the current signal
level and set scan_interval accordingly. This logic exists in
bgscan_simple but was missing in bgscan_learn.

Signed-hostap: Eyal Shapira <eyal@wizery.com>

wpa_supplicant/bgscan_learn.c

@@ -422,6 +422,14 @@ static void * bgscan_learn_init(struct wpa_supplicant *wpa_s,
 
 	data->supp_freqs = bgscan_learn_get_supp_freqs(wpa_s);
 	data->scan_interval = data->short_interval;
+	if (data->signal_threshold) {
+		/* Poll for signal info to set initial scan interval */
+		struct wpa_signal_info siginfo;
+		if (wpa_drv_signal_poll(wpa_s, &siginfo) == 0 &&
+		    siginfo.current_signal >= data->signal_threshold)
+			data->scan_interval = data->long_interval;
+	}
+
 	eloop_register_timeout(data->scan_interval, 0, bgscan_learn_timeout,
 			       data, NULL);