s4:torture:raw: fix 'Syscall param writev(vector[...])' valgrind error

s4:torture:raw: fix 'Syscall param writev(vector[...])' valgrind error

running smbtorture test raw.open.openx-over-dir.openx-over-dir results in
the following valgrind trace

==30597== Syscall param writev(vector[...]) points to uninitialised byte(s)
==30597==    at 0xFBA2C87: writev (in /lib64/libc-2.19.so)
==30597==    by 0x106CB033: writev_handler (async_sock.c:340)
==30597==    by 0xF67812A: ??? (in /usr/lib64/libtevent.so.0.9.26)
==30597==    by 0xF6765F6: ??? (in /usr/lib64/libtevent.so.0.9.26)
==30597==    by 0xF6727FC: _tevent_loop_once (in /usr/lib64/libtevent.so.0.9.26)
==30597==    by 0x5AE3400: smbcli_request_receive (rawrequest.c:416)
==30597==    by 0x5AE343E: smbcli_request_simple_recv (rawrequest.c:430)
==30597==    by 0x5ADC8BC: smb_raw_close (rawfile.c:847)
==30597==    by 0x9BE60B4: smbcli_close (clifile.c:316)
==30597==    by 0x1A57F0: test_openx_over_dir (open.c:1495)
==30597==    by 0x16B21D: wrap_simple_1smb_test (util_smb.c:856)
==30597==    by 0x955368F: internal_torture_run_test (torture.c:442)
==30597==    by 0x9553A6B: torture_run_test_restricted (torture.c:542)
==30597==    by 0x2600BD: run_matching (smbtorture.c:110)
==30597==    by 0x25FF7F: run_matching (smbtorture.c:95)
==30597==    by 0x25FF7F: run_matching (smbtorture.c:95)
==30597==    by 0x2601DE: torture_run_named_tests (smbtorture.c:143)
==30597==    by 0x261E5D: main (smbtorture.c:665)
==30597==  Address 0x187e41d6 is 598 bytes inside a block of size 1,325 alloc'd
==30597==    at 0x4C29110: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==30597==    by 0xF464A73: _talloc_pooled_object (in /usr/lib64/libtalloc.so.2.1.5)
==30597==    by 0xF67366D: _tevent_req_create (in /usr/lib64/libtevent.so.0.9.26)
==30597==    by 0xB0D49FF: smb1cli_req_create (smbXcli_base.c:1322)
==30597==    by 0x5ADFAB7: smbcli_transport_setup_subreq (clitransport.c:254)
==30597==    by 0x5ADFC37: smbcli_transport_send (clitransport.c:326)
==30597==    by 0x5AE33C3: smbcli_request_send (rawrequest.c:400)
==30597==    by 0x5ADC869: smb_raw_close_send (rawfile.c:832)
==30597==    by 0x5ADC8AC: smb_raw_close (rawfile.c:846)
==30597==    by 0x9BE60B4: smbcli_close (clifile.c:316)
==30597==    by 0x1A57F0: test_openx_over_dir (open.c:1495)
==30597==    by 0x16B21D: wrap_simple_1smb_test (util_smb.c:856)
==30597==    by 0x955368F: internal_torture_run_test (torture.c:442)
==30597==    by 0x9553A6B: torture_run_test_restricted (torture.c:542)
==30597==    by 0x2600BD: run_matching (smbtorture.c:110)
==30597==    by 0x25FF7F: run_matching (smbtorture.c:95)
==30597==    by 0x25FF7F: run_matching (smbtorture.c:95)
==30597==    by 0x2601DE: torture_run_named_tests (smbtorture.c:143)
==30597==    by 0x261E5D: main (smbtorture.c:665)
==30597==

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>