Fix 20/40 MHz co-ex report processing with obss_interval=0

If OBSS scan interval is not set, the AP must not schedule a timeout to
restore 40 MHz operation immediately after having moved to a 20 MHz
channel based on an unsolicited co-ex report. Fix this by scheduling the
timeout only if obss_interval is non-zero.

Since we do not currently support AP doing OBSS scans after the initial
BSS setup, this means practically that 40-to-20 MHz transition is
allowed, but 20-to-40 MHz is not with obss_interval=0. The latter gets
enabled if obss_interval is set to a non-zero value so that associated
STAs can take care of OBSS scanning.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/ieee802_11_ht.c

@@ -292,7 +292,8 @@ void hostapd_2040_coex_action(struct hostapd_data *hapd,
 			iface->conf->secondary_channel = 0;
 			ieee802_11_set_beacons(iface);
 		}
-		if (!iface->num_sta_ht40_intolerant) {
+		if (!iface->num_sta_ht40_intolerant &&
+		    iface->conf->obss_interval) {
 			unsigned int delay_time;
 			delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
 				iface->conf->obss_interval;