ieee802154: hwsim: using right kind of iteration

This patch fixes the error path to unsubscribe all other phy's from
current phy. The actually code using a wrong kind of list iteration may
copied from the case to unsubscribe the current phy from all other
phy's.

Cc: Stefan Schmidt <stefan@datenfreihafen.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: f25da51f ("ieee802154: hwsim: add replacement for fakelb")
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ieee802154/mac802154_hwsim.c

@@ -735,10 +735,12 @@ static int hwsim_subscribe_all_others(struct hwsim_phy *phy)
 	return 0;
 
 me_fail:
-	list_for_each_entry(phy, &hwsim_phys, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(e, &phy->edges, list) {
 		list_del_rcu(&e->list);
 		hwsim_free_edge(e);
 	}
+	rcu_read_unlock();
 sub_fail:
 	hwsim_edge_unsubscribe_me(phy);
 	return -ENOMEM;