wifi: cfg80211: handle IBSS in channel switch

Prior to commit 7b0a0e3c ("wifi: cfg80211: do some
rework towards MLO link APIs") the interface type didn't
really matter here, but now we need to handle all of the
possible cases. Add IBSS ("ADHOC") and handle it.

Fixes: 7b0a0e3c ("wifi: cfg80211: do some rework towards MLO link APIs")
Reported-by: syzbot+90d912872157e63589e4@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -18558,6 +18558,9 @@ void cfg80211_ch_switch_notify(struct net_device *dev,
 	case NL80211_IFTYPE_P2P_GO:
 		wdev->links[link_id].ap.chandef = *chandef;
 		break;
+	case NL80211_IFTYPE_ADHOC:
+		wdev->u.ibss.chandef = *chandef;
+		break;
 	default:
 		WARN_ON(1);
 		break;