wifi: nl80211: acquire wdev mutex for dump_survey

At least the quantenna driver calls wdev_chandef() here
which now requires the lock, so acquire it.

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

net/wireless/nl80211.c

@@ -10233,7 +10233,9 @@ static int nl80211_dump_survey(struct sk_buff *skb, struct netlink_callback *cb)
 	}
 
 	while (1) {
+		wdev_lock(wdev);
 		res = rdev_dump_survey(rdev, wdev->netdev, survey_idx, &survey);
+		wdev_unlock(wdev);
 		if (res == -ENOENT)
 			break;
 		if (res)