fix golangci-lint errors

Signed-off-by: Akhil Mohan <akhilerm@gmail.com>

content/helpers_test.go

@@ -143,6 +143,7 @@ func TestCopy(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
+		testcase := testcase
 		t.Run(testcase.name, func(t *testing.T) {
 			err := Copy(context.Background(),
 				&testcase.writer,

metadata/containers_test.go

@@ -619,6 +619,7 @@ func TestContainersCreateUpdateDelete(t *testing.T) {
 			},
 		},
 	} {
+		testcase := testcase
 		t.Run(testcase.name, func(t *testing.T) {
 			testcase.original.ID = testcase.name
 			if testcase.input.ID == "" {

metadata/images_test.go

@@ -479,6 +479,7 @@ func TestImagesCreateUpdateDelete(t *testing.T) {
 			cause: errdefs.ErrNotFound,
 		},
 	} {
+		testcase := testcase
 		t.Run(testcase.name, func(t *testing.T) {
 			testcase.original.Name = testcase.name
 			if testcase.input.Name == "" {

tracing/plugin/otlp.go

@@ -141,10 +141,9 @@ func newExporter(ctx context.Context, cfg *OTLPConfig) (*otlptrace.Exporter, err
 			opts = append(opts, otlptracegrpc.WithInsecure())
 		}
 		return otlptracegrpc.New(ctx, opts...)
-	} else {
-		// Other protocols such as "http/json" are not supported.
-		return nil, fmt.Errorf("OpenTelemetry protocol %q : %w", cfg.Protocol, errdefs.ErrNotImplemented)
 	}
+	// Other protocols such as "http/json" are not supported.
+	return nil, fmt.Errorf("OpenTelemetry protocol %q : %w", cfg.Protocol, errdefs.ErrNotImplemented)
 }
 
 // newTracer configures protocol-agonostic tracing settings such as

tracing/plugin/otlp_test.go

@@ -70,6 +70,7 @@ func TestNewExporter(t *testing.T) {
 			output: errdefs.ErrNotImplemented,
 		},
 	} {
+		testcase := testcase
 		t.Run(testcase.name, func(t *testing.T) {
 			t.Logf("input: %v", testcase.input)