wifi: nl80211: set BSS to NULL if IS_ERR()

If the BSS lookup returned an error, set it to NULL so we
don't try to free it.

Fixes: d648c230 ("wifi: nl80211: support MLO in auth/assoc")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -10767,6 +10767,7 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
 						  &bssid);
 			if (IS_ERR(req.links[link_id].bss)) {
 				err = PTR_ERR(req.links[link_id].bss);
+				req.links[link_id].bss = NULL;
 				goto free;
 			}