jscript: Fixed conversion in place in IVarianntChangeType::ChangeType

[Jacek Caban]

---
 dlls/jscript/jscript.c      |   14 +++++++++++---
 dlls/jscript/tests/caller.c |   10 ++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)


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