s3 rpc_client: Fix Asan stack use after scope
Fixes Asan error:
==1924==ERROR: AddressSanitizer: stack-use-after-scope on address
0x7ffe63f873d0 at pc 0x7fb99dae1733 bp 0x7ffe63f86a00 sp 0x7ffe63f861a8
READ of size 24 at 0x7ffe63f873d0 thread T0
#0 0x7fb99dae1732 (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x79732)
#1 0x7fb99cfe5549 in memcpy
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:34
#2 0x7fb99cfe5549 in ndr_push_bytes
../../librpc/ndr/ndr_basic.c:729
#3 0x7fb99cfe5646 in ndr_push_array_uint8
../../librpc/ndr/ndr_basic.c:754
#4 0x7fb99a69dd1b in ndr_push_netr_ChallengeResponse
librpc/gen_ndr/ndr_netlogon.c:462
#5 0x7fb99a6c5fab in ndr_push_netr_NetworkInfo
librpc/gen_ndr/ndr_netlogon.c:556
#6 0x7fb99a6c749d in ndr_push_netr_LogonLevel
librpc/gen_ndr/ndr_netlogon.c:783
#7 0x7fb99a7222de in ndr_push_netr_LogonSamLogonEx
librpc/gen_ndr/ndr_netlogon.c:16547
#8 0x7fb99c982c97 in dcerpc_binding_handle_call_send
../../librpc/rpc/binding_handle.c:416
Bug: https://bugzilla.samba.org/show_bug.cgi?id=13936
Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri May 10 10:02:21 UTC 2019 on sn-devel-184