oleaut32: Handle integer overflow of len in SysReAllocStringLen and SysAllocStringByteLen.

[Robert Shearman]

---
  dlls/oleaut32/oleaut.c        |    8 ++++++++
  dlls/oleaut32/tests/vartype.c |    3 +++
  2 files changed, 11 insertions(+), 0 deletions(-)
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