ERR_remove_thread_state() does the same thing, except the identifier is
an opaque pointer.
-=head1 RETURN VALUE
+=head1 RETURN VALUES
ERR_remove_state() and ERR_remove_thread_state() return no value.
=head1 COPYRIGHT
-Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy