jilles dc581a988b nice(): Put back old return value, keeping [EPERM] error.
Commit r279154 changed the API and ABI significantly, and {NZERO} is still
wrong.

Also, preserve errno on success instead of setting it to 0.

PR:		189821
Reported by:	bde
Relnotes:	yes
2015-02-28 18:22:10 +00:00
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