fix a deadlock when not using --auto

Live update never gets started, but then it still waited for it to
finish.

This only deadlocked with -J4 or so, not without -J. Unsure why.

Annex/RepoSize/LiveUpdate.hs

@@ -109,7 +109,8 @@ checkLiveUpdate lu a = Db.lockDbWhile (const go) go
 
 finishedLiveUpdate :: LiveUpdate -> UUID -> Key -> SizeChange -> IO ()
 finishedLiveUpdate NoLiveUpdate _ _ _ = noop
-finishedLiveUpdate lu u k sc = do
+finishedLiveUpdate lu u k sc =
+	whenM (not <$> isEmptyMVar (liveUpdateReady lu)) $ do
 		finishv <- newEmptyMVar
 		tryNonAsync (putMVar (liveUpdateDone lu) (Just (u, k, sc, finishv))) >>= \case
 			Right () -> void $ tryNonAsync $ takeMVar finishv