Roel Kluin writes:

> Check to prevent unsigned wrap of size before subtraction.
> 
> Signed-off-by: Roel Kluin <roel.kl...@gmail.com>
> ---
> Is this maybe better or are we certain that size can't wrap?

Patch looks good, though while you're at it, you could add a space
after the "while".

Acked-by: Paul Mackerras <pau...@samba.org>
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