new Valgrind errors in oleaut32

[Dan Kegel]

James just barely touched the oleaut32 tests, and
as a side effect, we now have several more warnings of the sort

+ Conditional jump or move depends on uninitialised value(s)
+    at  VARIANT_DI_tostringW (vartype.c:4852)
+    by  VarBstrFromCy (vartype.c:6519)
+    by  VariantChangeTypeEx (variant.c:433)
+    by  VarCat (variant.c:2555)
+    by  test_VarCat (vartest.c:5246)
+    by  func_vartest (vartest.c:8436)
+    by  run_test (test.h:406)
+    by  main (test.h:455)

and

+ Conditional jump or move depends on uninitialised value(s)
+    at  __printf_fp (in /lib/tls/i686/cmov/libc-2.6.1.so)
+    by  vfprintf (in /lib/tls/i686/cmov/libc-2.6.1.so)
+    by  vsprintf (in /lib/tls/i686/cmov/libc-2.6.1.so)
+    by  sprintf (in /lib/tls/i686/cmov/libc-2.6.1.so)
+    by  vsnprintfW (string.c:408)
+    by  sprintfW (string.c:455)
+    by  VARIANT_BstrFromReal (vartype.c:6406)
+    by  VarBstrFromR4 (vartype.c:6457)
+    by  VariantChangeTypeEx (variant.c:430)
+    by  VarCat (variant.c:2555)
+    by  test_VarCat (vartest.c:5246)
+    by  func_vartest (vartest.c:8454)
+    by  run_test (test.h:406)
+    by  main (test.h:455)

See http://kegel.com/wine/valgrind/logs-2008-04-17/vg-oleaut32_vartest-diff.txt