[Pkg-samba-maint] Bug#912717: possible upstream fix

[Fabian Grünbichler]

according to one of our downstream users (https://bugzilla.proxmox.com/show_bug.cgi?id=2333)

> the problem is fixed by git commit https://github.com/samba-team/samba/commit/47466691ccb9f73677dc43de3206e365f2daf611.

> samba release 4.10.13+ should contain this fix

so bullseye should already contain the fix - not sure whether you want 
to investigate a cherry-pick for buster ;)