[PATCH,HURD] mknod: allow to create also sockets

[Pino Toscano]

Hi,

attached there is a small patch to allow Hurd's mknod(at) to create also 
sockets; while POSIX does not specify them, on Linux they seem to be 
supported, and the implementation is very small.
I also took the liberty of simplifying the checks done to decide whether 
use the device number provided.

Thanks,
-- 
Pino Toscano
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