Fix util_is_printable_string

[David Gibson]

On Fri, Jan 04, 2013 at 09:12:58PM +0200, Pantelis Antoniou wrote:
> The method used did not account for multi-part strings.
> 
> Signed-off-by: Pantelis Antoniou <panto at antoniou-consulting.com>

I think it could do with some more commenting of exactly what it's
considering a printable string(s).  I'm pretty sure it's doing the
right thing, but if you're not already familiar with the OF
multi-string convention, it would be easy to get confused by the
code.  Other than that

Acked-by: David Gibson <david at gibson.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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