rbtree.h compiler warning fix

[Savin Zlobec <savin dot zlobec at email dot si>]

The attached patch fixes a 'pointer of type `void *' used in subtraction'
compiler warning in compat/linux/current/include/linux/rbtree.h.

I've also noticed, that the bug in rbtree.c described and fixed in

http://sources.redhat.com/ml/ecos-discuss/2003-07/msg00266.html

was not commited to CVS. It there any reason not to commit it?

I use the rbtree code in my block cache library, wich works without 
problems with the mentioned patch applied (without it doesn't work at all). 

savin

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