Run 'gofmt -s -w' on these files

merkledag.go

@@ -181,7 +181,7 @@ func (ds *dagService) GetNodes(ctx context.Context, keys []u.Key) []NodeGetter {
 
 	promises := make([]NodeGetter, len(keys))
 	sendChans := make([]chan<- *Node, len(keys))
-	for i, _ := range keys {
+	for i := range keys {
 		promises[i], sendChans[i] = newNodePromise(ctx)
 	}
 

merkledag_test.go

@@ -132,7 +132,7 @@ func SubtestNodeStat(t *testing.T, n *Node) {
 type devZero struct{}
 
 func (_ devZero) Read(b []byte) (int, error) {
-	for i, _ := range b {
+	for i := range b {
 		b[i] = 0
 	}
 	return len(b), nil