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

[Roland McGrath]

> To be honest, I was making tst-mknodat.c pass on Hurd; if it does not 
> make sense that mknod can create sockets, then that test should be 
> removed, since all it does is testing the creation of a single socket.

I think the intent of the change is to test the mknodat interface, not any
particular kind of node.  Just change the test to create a FIFO instead.


Thanks,
Roland