s4:torture: Fix stack variable used out of scope in test_devicemode_full()

s4:torture: Fix stack variable used out of scope in test_devicemode_full()

==17828==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffc37790230 at pc 0x7fc37e2a3a11 bp 0x7ffc3778fec0 sp 0x7ffc3778feb8
READ of size 16 at 0x7ffc37790230 thread T0
    #0 0x7fc37e2a3a10 in ndr_push_spoolss_GetPrinter librpc/gen_ndr/ndr_spoolss.c:27123
    #1 0x7fc380629b30 in dcerpc_binding_handle_call_send ../../librpc/rpc/binding_handle.c:416
    #2 0x7fc38062a132 in dcerpc_binding_handle_call ../../librpc/rpc/binding_handle.c:553
    #3 0x7fc37ed113c9 in dcerpc_spoolss_GetPrinter_r librpc/gen_ndr/ndr_spoolss_c.c:1947
    #4 0x5570ba6c4d03 in test_devicemode_full ../../source4/torture/rpc/spoolss.c:2249
    #5 0x5570ba6e61ea in test_PrinterInfo_DevModes ../../source4/torture/rpc/spoolss.c:2384
    #6 0x5570ba6e61ea in test_PrinterInfo_DevMode ../../source4/torture/rpc/spoolss.c:2488
    #7 0x5570ba6e61ea in test_printer_dm ../../source4/torture/rpc/spoolss.c:9082
    #8 0x7fc37fc7b67d in wrap_test_with_simple_test ../../lib/torture/torture.c:808
    #9 0x7fc37fc7d40b in internal_torture_run_test ../../lib/torture/torture.c:516
    #10 0x7fc37fc7d87c in torture_run_tcase_restricted ../../lib/torture/torture.c:581
    #11 0x7fc37fc7deb2 in torture_run_suite_restricted ../../lib/torture/torture.c:435
    #12 0x5570ba89a65d in run_matching ../../source4/torture/smbtorture.c:95
    #13 0x5570ba89a6e4 in run_matching ../../source4/torture/smbtorture.c:105
    #14 0x5570ba89a6e4 in run_matching ../../source4/torture/smbtorture.c:105
    #15 0x5570ba89b3e4 in torture_run_named_tests ../../source4/torture/smbtorture.c:172
    #16 0x5570ba89f3e0 in main ../../source4/torture/smbtorture.c:750
    #17 0x7fc37c62c5af in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
    #18 0x7fc37c62c678 in __libc_start_main_impl ../csu/libc-start.c:381
    #19 0x5570ba49e824 in _start ../sysdeps/x86_64/start.S:115

Address 0x7ffc37790230 is located in stack of thread T0 at offset 160 in frame
    #0 0x5570ba6c4562 in test_devicemode_full ../../source4/torture/rpc/spoolss.c:2186

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Dec 20 06:55:45 UTC 2022 on sn-devel-184