DH_free() frees the B<DH> structure and its components. The values are
erased before the memory is returned to the system.
+If B<dh> is NULL nothing is done.
=head1 RETURN VALUES
=head1 SEE ALSO
-L<dh(3)|dh(3)>, L<err(3)|err(3)>,
+L<dh(3)|dh(3)>, L<ERR_get_error(3)|ERR_get_error(3)>,
L<DH_generate_parameters(3)|DH_generate_parameters(3)>,
L<DH_generate_key(3)|DH_generate_key(3)>