[PATCH,HURD] hurd: compliance fixes for ptsname_r

[Pino Toscano]

Hi,

attached there is a patch to fix few issues in Hurd's ptsname_r(), 
mostly checking for more error conditions and making sure to set as 
errno and return the proper values on error conditions.

Thanks,
-- 
Pino Toscano

hurd_ptsname.diff
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