fix "prealloc" linting

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

notifications/listener_test.go

@@ -127,9 +127,6 @@ func checkTestRepository(t *testing.T, repository distribution.Repository, remov
 	configDgst := digest.FromBytes(config)
 	configReader := bytes.NewReader(config)
 
-	var blobDigests []digest.Digest
-	blobDigests = append(blobDigests, configDgst)
-
 	blobs := repository.Blobs(ctx)
 
 	// push config blob
@@ -153,6 +150,8 @@ func checkTestRepository(t *testing.T, repository distribution.Repository, remov
 		},
 	}
 
+	blobDigests := make([]digest.Digest, 0, 3)
+	blobDigests = append(blobDigests, configDgst)
 	for range 2 {
 		rs, dgst, err := testutil.CreateRandomTarFile()
 		if err != nil {

registry/storage/driver/s3-aws/s3_test.go

@@ -1051,7 +1051,7 @@ func TestListObjectsV2(t *testing.T) {
 	ctx := dcontext.Background()
 	n := 6
 	prefix := "/test-list-objects-v2"
-	var filePaths []string
+	filePaths := make([]string, 0, n)
 	for i := range n {
 		filePaths = append(filePaths, fmt.Sprintf("%s/%d", prefix, i))
 	}

registry/storage/linkedblobstore_test.go

@@ -21,7 +21,7 @@ func TestLinkedBlobStoreEnumerator(t *testing.T) {
 	fooEnv := newManifestStoreTestEnv(t, fooRepoName, "thetag")
 	ctx := context.Background()
 
-	var expected []string
+	expected := make([]string, 0, 2)
 	for range 2 {
 		rs, dgst, err := testutil.CreateRandomTarFile()
 		if err != nil {