wifi: mac80211: debugfs: lock wiphy instead of RTNL

Since we no longer really use the RTNL, there's no point
in locking it here. Most drivers don't really need to
have any locks here anyway, and the rest are probably
completely broken, but it's a debugfs-only callback so
it really doesn't matter much.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/debugfs.c

@@ -4,7 +4,7 @@
  *
  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
- * Copyright (C) 2018 - 2019, 2021-2022 Intel Corporation
+ * Copyright (C) 2018 - 2019, 2021-2023 Intel Corporation
  */
 
 #include <linux/debugfs.h>
@@ -594,9 +594,9 @@ static ssize_t format_devstat_counter(struct ieee80211_local *local,
 	char buf[20];
 	int res;
 
-	rtnl_lock();
+	wiphy_lock(local->hw.wiphy);
 	res = drv_get_stats(local, &stats);
-	rtnl_unlock();
+	wiphy_unlock(local->hw.wiphy);
 	if (res)
 		return res;
 	res = printvalue(&stats, buf, sizeof(buf));