ole32: Fix an invalid usage of InterlockedCompareExchange.

[Sebastian Lackner]

The result of InterlockedCompareExchange is compared against the new value instead of the old value.
No critical issue, but it needs two loops until it finally finishes instead of one. 

---
 dlls/ole32/marshal.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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