[Issue 9288] back-ldap triggers assert in bind.c

https://bugs.openldap.org/show_bug.cgi?id=9288

--- Comment #6 from tero.saarni@est.tech --- Here is a notice of origin and rights statement for the merge request

The attached patch file is derived from OpenLDAP Software. All of the modifications to OpenLDAP Software represented in the following patch(es) were developed by Tero Saarni tero.saarni@est.tech. I have not assigned rights and/or interest in this work to any party.

Ericsson Software Technology AB hereby place the following modifications to OpenLDAP Software (and only these modifications) into the public domain. Hence, these modifications may be freely used and/or redistributed for any purpose with or without attribution and/or other notice.