ole32: Check that the storage was opened with write access before creating a new stream or sub-storage

[Robert Shearman]

ChangeLog:
Check that the storage was opened with write access before creating a 
new stream or sub-storage.

  dlls/ole32/storage32.c       |   10 ++++++++++
  dlls/ole32/tests/storage32.c |    2 --
  2 files changed, 10 insertions(+), 2 deletions(-)

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