wifi: mac80211_hwsim: warn on invalid link address

Catch the bugs fixed in mac80211 by the previous commits
and warn if an invalid address is added (or removed).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/mac80211_hwsim.c

@@ -1299,6 +1299,8 @@ static void mac80211_hwsim_config_mac_nl(struct ieee80211_hw *hw,
 	struct sk_buff *skb;
 	void *msg_head;
 
+	WARN_ON(!is_valid_ether_addr(addr));
+
 	if (!_portid && !hwsim_virtio_enabled)
 		return;