https://github.com/openjdk/jdk/blob/044e2a2a499ff63dffae355b2254ec6bfcc3e01d/src/hotspot/share/classfile/klassFactory.cpp#L209

  InstanceKlass* result = parser.create_instance_klass(old_stream != stream, *cl_inst_info, CHECK_NULL);

  if (result == NULL) {
    return NULL;
  }

But parser.create_instance_klass() will never return NULL in a normal return.

We should get rid of the above "if" check. Then, we can remove unnecessary NULL checks by callers of create_from_stream. E.g., here in systemDictionary.cpp:

  InstanceKlass* k = KlassFactory::create_from_stream(st,
                                                      class_name,
                                                      loader_data,
                                                      cl_info,
                                                      CHECK_NULL);
  if ((cl_info.is_hidden() || is_unsafe_anon_class) && k != NULL) {