s4:torture:raw: fix 'Conditional jump or move' valgrind error.

s4:torture:raw: fix 'Conditional jump or move' valgrind error.

smbtorture test raw.bench-tcon.bench-tcon produces the following valgrind
trace

==32163== Conditional jump or move depends on uninitialised value(s)
==32163==    at 0x1F9D61: rate_convert_secs (tconrate.c:149)
==32163==    by 0x1FA04C: torture_bench_treeconnect (tconrate.c:189)
==32163==    by 0x9553F62: wrap_simple_test (torture.c:632)
==32163==    by 0x955368F: internal_torture_run_test (torture.c:442)
==32163==    by 0x9553A6B: torture_run_test_restricted (torture.c:542)
==32163==    by 0x260121: run_matching (smbtorture.c:110)
==32163==    by 0x25FFE3: run_matching (smbtorture.c:95)
==32163==    by 0x260242: torture_run_named_tests (smbtorture.c:143)
==32163==    by 0x261EC1: main (smbtorture.c:665)
==32163==
==32163== Use of uninitialised value of size 8
==32163==    at 0xFB0B0BB: _itoa_word (in /lib64/libc-2.19.so)
==32163==    by 0xFB0EAD2: vfprintf (in /lib64/libc-2.19.so)
==32163==    by 0xFB15598: printf (in /lib64/libc-2.19.so)
==32163==    by 0x1FA064: torture_bench_treeconnect (tconrate.c:188)
==32163==    by 0x9553F62: wrap_simple_test (torture.c:632)
==32163==    by 0x955368F: internal_torture_run_test (torture.c:442)
==32163==    by 0x9553A6B: torture_run_test_restricted (torture.c:542)
==32163==    by 0x260121: run_matching (smbtorture.c:110)
==32163==    by 0x25FFE3: run_matching (smbtorture.c:95)
==32163==    by 0x260242: torture_run_named_tests (smbtorture.c:143)
==32163==    by 0x261EC1: main (smbtorture.c:665)

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