[Crash-utility] do_radix_tree() function in filesys.c

[Alan Tyson]

I notice that there is a function to look at radix trees in filesys.c, 
but it's not called by anything in the crash executable from what I can 
see.  In fact when I wrote a small extension to call it, I see that it 
simply doesn't work for several reasons (wrong structures, incorrect 
dereferencing of pointers).  Attached is a patch which addresses these.  
I've tested it on i686, x86_64 and ia64.

If you think that this type of ("utility") code is best left out of 
crash, then let's just remove this from the source and not clutter it 
with dead code.  Personally, I think it's nice to have it there... when 
it works.

Regards,

Alan Tyson, HP.
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