ole32: Remove casts

[Mike McCormack]

---
This is the way ref counting is done everywhere else in Wine.

Ref counts can be assumed to be between 0 and MAXLONG, so the fact that 
LONG is signed isn't important.

Casting ULONG* to LONG* to solve the above problem is unnecessary.

  dlls/ole32/compobj_private.h |    4 ++--
  dlls/ole32/marshal.c         |    8 ++++----
  2 files changed, 6 insertions(+), 6 deletions(-)
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