K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2015-02-28T18:22:10.052745Z
K 7
svn:log
V 246
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

END