pkg/archive/changes_posix_test.go: un-comment code line "defer os.RemoveAll(src)"

Signed-off-by: Lei Jitang <leijitang@huawei.com>

pkg/archive/changes_posix_test.go

@@ -20,7 +20,7 @@ func TestHardLinkOrder(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	//defer os.RemoveAll(src)
+	defer os.RemoveAll(src)
 	for _, name := range names {
 		func() {
 			fh, err := os.Create(path.Join(src, name))