Clean up unused variable from unit test.

Author: RainbowMango

staging/src/k8s.io/component-base/metrics/registry_test.go

@@ -99,7 +99,6 @@ func TestRegister(t *testing.T) {
 	var tests = []struct {
 		desc                    string
 		metrics                 []*Counter
-		registryVersion         *semver.Version
 		expectedErrors          []error
 		expectedIsCreatedValues []bool
 		expectedIsDeprecated    []bool
@@ -108,7 +107,6 @@ func TestRegister(t *testing.T) {
 		{
 			desc:                    "test alpha metric",
 			metrics:                 []*Counter{alphaCounter},
-			registryVersion:         &v115,
 			expectedErrors:          []error{nil},
 			expectedIsCreatedValues: []bool{true},
 			expectedIsDeprecated:    []bool{false},
@@ -117,7 +115,6 @@ func TestRegister(t *testing.T) {
 		{
 			desc:                    "test registering same metric multiple times",
 			metrics:                 []*Counter{alphaCounter, alphaCounter},
-			registryVersion:         &v115,
 			expectedErrors:          []error{nil, prometheus.AlreadyRegisteredError{}},
 			expectedIsCreatedValues: []bool{true, true},
 			expectedIsDeprecated:    []bool{false, false},
@@ -126,7 +123,6 @@ func TestRegister(t *testing.T) {
 		{
 			desc:                    "test alpha deprecated metric",
 			metrics:                 []*Counter{alphaDeprecatedCounter},
-			registryVersion:         &v115,
 			expectedErrors:          []error{nil},
 			expectedIsCreatedValues: []bool{true},
 			expectedIsDeprecated:    []bool{true},
@@ -135,7 +131,6 @@ func TestRegister(t *testing.T) {
 		{
 			desc:                    "test alpha hidden metric",
 			metrics:                 []*Counter{alphaHiddenCounter},
-			registryVersion:         &v115,
 			expectedErrors:          []error{nil},
 			expectedIsCreatedValues: []bool{false},
 			expectedIsDeprecated:    []bool{true},
@@ -152,7 +147,7 @@ func TestRegister(t *testing.T) {
 			})
 			for i, m := range test.metrics {
 				err := registry.Register(m)
-				if err != test.expectedErrors[i] && err.Error() != test.expectedErrors[i].Error() {
+				if err != nil && err.Error() != test.expectedErrors[i].Error() {
 					t.Errorf("Got unexpected error %v, wanted %v", err, test.expectedErrors[i])
 				}
 				if m.IsCreated() != test.expectedIsCreatedValues[i] {