mshtml: Use TLS_OUT_OF_INDEXES as invalid TLS value.

[Jacek Caban]

Spotted by Vitaliy Margolen.
---
  dlls/mshtml/main.c |    4 ++--
  dlls/mshtml/task.c |   16 ++++++++++++----
  2 files changed, 14 insertions(+), 6 deletions(-)


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