format some code in dockershim

pkg/kubelet/dockershim/docker_service.go

@@ -325,9 +325,8 @@ func (ds *dockerService) GetPodPortMappings(podSandboxID string) ([]*hostport.Po
 		if err == errors.CheckpointNotFoundError {
 			glog.Warningf("Failed to retrieve checkpoint for sandbox %q: %v", podSandboxID, err)
 			return nil, nil
-		} else {
-			return nil, err
 		}
+		return nil, err
 	}
 
 	portMappings := make([]*hostport.PortMapping, 0, len(checkpoint.Data.PortMappings))

pkg/kubelet/dockershim/libdocker/fake_client.go

@@ -372,9 +372,8 @@ func (f *FakeDockerClient) popError(op string) error {
 	if ok {
 		delete(f.Errors, op)
 		return err
-	} else {
-		return nil
 	}
+	return nil
 }
 
 // ListContainers is a test-spy implementation of Interface.ListContainers.

pkg/kubelet/dockershim/libdocker/instrumented_client.go

@@ -32,7 +32,7 @@ type instrumentedInterface struct {
 	client Interface
 }
 
-// Creates an instrumented Interface from an existing Interface.
+// NewInstrumentedInterface creates an instrumented Interface from an existing Interface.
 func NewInstrumentedInterface(dockerClient Interface) Interface {
 	return instrumentedInterface{
 		client: dockerClient,