oleaut32: tests/vartype.c: use VariantInit, not VariantClear, to initialize new variants

[Dan Kegel]

Found with Valgrind.  Fixes

 Conditional jump or move depends on uninitialised value(s)
    at VariantClear (variant.c:545)
    by test_NullByRef (vartype.c:5795)
  Uninitialised value was created by a stack allocation
    at test_NullByRef (vartype.c:5791)

and

 Conditional jump or move depends on uninitialised value(s)
    at VariantClear (variant.c:623)
    by test_ChangeType_keep_dst (vartype.c:5830)
  Uninitialised value was created by a stack allocation
    at test_ChangeType_keep_dst (vartype.c:5822)
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