[PATCH,HURD] hurd: compliance fixes for getgroups

[Pino Toscano]

Hi,

attached there is a patch to fix a couple of issues with Hurd's 
getgroups(), namely when the requested number is < 0 or when it is > 0 
but less than the actual number of groups that would be returned (this 
case is handled by simply returning the first n groups, instead of 
failing).

Thanks,
-- 
Pino Toscano

hurd_getgroups.diff
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