powerpc/xive: Fix the size of the cpumask used in xive_find_target_in_mask()

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Subject: powerpc/xive: Fix the size of the cpumask used in xive_find_target_in_mask()
From: Stewart Smith <stewart@xxxxxxxxxxxxxxxxxx>
Date: Tue, 31 Oct 2017 12:10:46 +1100
Cc: clg@xxxxxxxx, mpe@xxxxxxxxxxxxxx

commit	a9dadc1c512807f955f0799e85830b420da47932 upstream

To be applied to v4.13.x

Why?

We've hit this WARN_ON in the v4.13.x stable kernel we include in
firmware (where we follow upstream stable).

-- 
Stewart Smith
OPAL Architect, IBM.

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