wifi: mac80211: always initialize match_auth

My previous patch only initialized match_auth when the
ifmgd->auth_data exists, but that was wrong, it should
always be set. Fix that.

Fixes: 310c838 ("wifi: mac80211: clean up connection process")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/3151f5d0-c18f-413d-b34b-b94f095b947c@moroto.mountain
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240301193633.1a3fc370f211.I979dd222b3b5eb5e1437886e5f7c2355eeccb9f7@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/mlme.c

@@ -8129,10 +8129,10 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
 	       sizeof(ifmgd->s1g_capa_mask));
 
 	/* keep some setup (AP STA, channel, ...) if matching */
-	if (ifmgd->auth_data)
-		match_auth = ether_addr_equal(ifmgd->auth_data->ap_addr,
-					      assoc_data->ap_addr) &&
-			     ifmgd->auth_data->link_id == req->link_id;
+	match_auth = ifmgd->auth_data &&
+		     ether_addr_equal(ifmgd->auth_data->ap_addr,
+				      assoc_data->ap_addr) &&
+		     ifmgd->auth_data->link_id == req->link_id;
 
 	if (req->ap_mld_addr) {
 		uapsd_supported = true;