ed 9797ba242b Properly set the return value for casueword to 0 upon success.
While trying to get multithreading working for CloudABI on aarch64, I
noticed that compare-and-exchange operations in kernelspace would always
fail. It turns out that we don't properly set the return value to 0 when
the compare and exchange succeeds.

Approved by:	andrew
Differential Revision:	https://reviews.freebsd.org/D3899
2015-10-15 17:50:28 +00:00
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