Some improvements for golint, ineffassign and misspell

pkg/util/retryutil/retry_util_test.go

@@ -13,7 +13,7 @@ type mockTicker struct {
 func (t *mockTicker) Stop() {}
 
 func (t *mockTicker) Tick() {
-	t.counter += 1
+	t.counter++
 }
 
 func TestRetryWorkerSuccess(t *testing.T) {
@@ -36,13 +36,13 @@ func TestRetryWorkerOneFalse(t *testing.T) {
 
 	tick := &mockTicker{t, 0}
 	result := RetryWorker(1, 3, tick, func() (bool, error) {
-		counter += 1
+		counter++
 
 		if counter <= 1 {
 			return false, nil
-		} else {
-			return true, nil
 		}
+
+		return true, nil
 	})
 
 	if result != nil {