nl80211: do a struct assignment to radar_chandef instead of memcpy()

We are copying one entire structure to another of the same type in
nl80211_notify_radar_detection, so it's simpler and safer to do a
struct assignment instead of memcpy().
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -8181,7 +8181,7 @@ static int nl80211_notify_radar_detection(struct sk_buff *skb,
 
 	cfg80211_sched_dfs_chan_update(rdev);
 
-	memcpy(&rdev->radar_chandef, &chandef, sizeof(chandef));
+	rdev->radar_chandef = chandef;
 
 	/* Propagate this notification to other radios as well */
 	queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);