s4:rpc_server: Properly initialize ‘lsa_CreateTrustedDomainEx2’ structure (CID 1499404)

s4:rpc_server: Properly initialize ‘lsa_CreateTrustedDomainEx2’ structure (CID 1499404)

dcesrv_lsa_CreateTrustedDomain_base() invokes DCESRV_PULL_HANDLE(),
which invokes DCESRV_PULL_HANDLE_RETVAL(), which invokes
DCESRV_CHECK_HANDLE(), which might invoke DCESRV_FAULT(), which accesses
r2.out.result, which is uninitialized — invoking undefined behaviour.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Thu Nov  2 04:04:49 UTC 2023 on atb-devel-224