wifi: cfg80211: remove chandef check in cfg80211_cac_event()

The current check only worked for AP mode, but we can do
radar detection in mesh as well (for example). We could
try to check this using wdev_chandef(), but we also don't
really care since the chandef is passed in and we have no
need to use it anymore (since we added the argument in
commit d2859df5 ("cfg80211/mac80211: DFS setup chandef
for cac event")).

Change-Id: I856e4344d5e64ff4d2eead0b4c53b11f264be9b8
Fixes: 7b0a0e3c ("wifi: cfg80211: do some rework towards MLO link APIs")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/mlme.c

@@ -949,9 +949,6 @@ void cfg80211_cac_event(struct net_device *netdev,
 	if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
 		return;
 
-	if (WARN_ON(!wdev->links[0].ap.chandef.chan))
-		return;
-
 	switch (event) {
 	case NL80211_RADAR_CAC_FINISHED:
 		timeout = wdev->cac_start_time +