dsdb: Fix dsdb_next_callback to correctly use ldb_module_done() etc
If we do not call ldb_module_done() then we do not know that up_req->callback()
has been called, and ldb_next_request() will call the callback again.
If called twice, the new ldb_lock_backend_callback() in ldb 1.2.0 will segfault.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12904
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Aug 1 07:52:38 CEST 2017 on sn-devel-144