filedoalloc change

[Ulrich Drepper]

In case you wonder about this filedoalloc change.  I just had to look
at some trace of a program starting up and somehow it striked me as if
something is redundant.  It was the ioctl() syscall (via isatty).  The
info was already included in the fstat done before.  So we hardcode a
bit more device number information and safe one syscall and at least 3
relocations :-).

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Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
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