Cleanup many lint warnings

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

node/impl/client/client.go

@@ -427,7 +427,7 @@ func (a *API) ClientGenCar(ctx context.Context, ref api.FileRef, outputPath stri
 		return err
 	}
 
-	defer bufferedDS.Remove(ctx, c)
+	defer bufferedDS.Remove(ctx, c) //nolint:errcheck
 	ssb := builder.NewSelectorSpecBuilder(basicnode.Style.Any)
 
 	// entire DAG selector
@@ -435,7 +435,7 @@ func (a *API) ClientGenCar(ctx context.Context, ref api.FileRef, outputPath stri
 		ssb.ExploreAll(ssb.ExploreRecursiveEdge())).Node()
 
 	f, err := os.Create(outputPath)
-	defer f.Close()
+	defer f.Close() //nolint:errcheck
 	if err != nil {
 		return err
 	}

node/impl/full/chain.go

@@ -425,7 +425,7 @@ func (a *ChainAPI) ChainExport(ctx context.Context, tsk types.TipSetKey) (<-chan
 	r, w := io.Pipe()
 	out := make(chan []byte)
 	go func() {
-		defer w.Close()
+		defer w.Close() //nolint:errcheck // it is a pipe
 		if err := a.Chain.Export(ctx, ts, w); err != nil {
 			log.Errorf("chain export call failed: %s", err)
 			return

node/impl/remoteworker.go

@@ -17,7 +17,7 @@ import (
 )
 
 type remoteWorker struct {
-	api.WorkerApi
+	api.WorkerAPI
 	closer jsonrpc.ClientCloser
 }