msxml: tests/domdoc.c: use VariantInit, not VariantClear, to initialize new variants

[Dan Kegel]

Because It's The Right Thing To Do.
Fixes:
Conditional jump or move depends on uninitialised value(s)
   at VARIANT_ValidateType (variant.c:545)
   by VariantClear (variant.c:598)
   by test_XPath (domdoc.c:1937)
   by func_domdoc (domdoc.c:3332)
 Uninitialised value was created by a stack allocation
   at test_XPath (domdoc.c:1834)
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