fixup! backfill: implement loop

Signed-off-by: Sumner Evans <sumner@beeper.com>

backfillqueue.go

@@ -310,12 +310,13 @@ func (user *User) getRoomsForBackfillAndEnqueue(ctx context.Context) {
 
 	// Create all of the portals locally and enqueue backfill requests for
 	// all of them.
-	portals := []*Portal{}
 	txn, err := user.bridge.DB.Begin()
 	{
+		portals := []*Portal{}
 		var i int
-		for guid, roomInfo := range roomInfoResp.Rooms {
-			portal := user.bridge.GetPortalByGUIDWithTransaction(txn, guid)
+		for _, chatIdentifier := range chats {
+			roomInfo := roomInfoResp.Rooms[chatIdentifier.ChatGUID]
+			portal := user.bridge.GetPortalByGUIDWithTransaction(txn, chatIdentifier.ChatGUID)
 			portal.MXID = roomInfo.RoomID
 			portal.Update(txn)
 			portals = append(portals, portal)