ERR_pop_to_mark() returns 0 if there was no mark in the error stack, which
implies that the stack became empty, otherwise 1.
-=head1 SEE ALSO
-
-L<err(3)>
-
=head1 COPYRIGHT
-Copyright 2003-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2003-2017 The OpenSSL Project Authors. All Rights Reserved.
-Licensed under the OpenSSL license (the "License"). You may not use
+Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.