[PATCH] clean up compiler warnings in 2.5 bk

[Paul Mackerras]

Nathan Lynch writes:

> I prefer it because use of NULL implies that np->node is a pointer,
> which it is not.  The compiler's warning seems valid to me.

Ah, yes, my mistake.  OK, then your change is fine.  I was thinking of
ppc32, where a phandle is a void *.

Regards,
Paul.

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