make lint happy

go.mod

@@ -115,6 +115,7 @@ require (
 	github.com/libp2p/go-libp2p-record v0.2.0
 	github.com/libp2p/go-libp2p-routing-helpers v0.2.3
 	github.com/libp2p/go-maddr-filter v0.1.0
+	github.com/libp2p/go-msgio v0.2.0
 	github.com/mattn/go-isatty v0.0.16
 	github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
 	github.com/mitchellh/go-homedir v1.1.0
@@ -254,7 +255,6 @@ require (
 	github.com/libp2p/go-libp2p-kbucket v0.5.0 // indirect
 	github.com/libp2p/go-libp2p-noise v0.5.0 // indirect
 	github.com/libp2p/go-libp2p-tls v0.5.0 // indirect
-	github.com/libp2p/go-msgio v0.2.0 // indirect
 	github.com/libp2p/go-nat v0.1.0 // indirect
 	github.com/libp2p/go-netroute v0.2.0 // indirect
 	github.com/libp2p/go-openssl v0.1.0 // indirect

markets/retrievaladapter/client_blockstore.go

@@ -51,7 +51,7 @@ type APIBlockstoreAccessor struct {
 	retrStores   map[retrievalmarket.DealID]api.RemoteStoreID
 	remoteStores map[api.RemoteStoreID]bstore.Blockstore
 
-	accessLk sync.Locker
+	accessLk sync.Mutex
 }
 
 func (a *APIBlockstoreAccessor) Get(id retrievalmarket.DealID, payloadCID retrievalmarket.PayloadCID) (bstore.Blockstore, error) {

node/impl/client/client.go

@@ -1022,6 +1022,8 @@ func (a *API) outputCAR(ctx context.Context, ds format.DAGService, bs bstore.Blo
 		cs := cid.NewSet()
 
 		for _, dagSpec := range dags {
+			dagSpec := dagSpec
+
 			if err := utils.TraverseDag(
 				ctx,
 				ds,