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2021-10-07T03:29:18.455119Z
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[PowerPC] Fix atomic_cmpset_masked().

A recent kernel change caused the previously unused atomic_cmpset_masked() to
be used.

It had a typo in it.

Instead of reading the old value from an uninitialized variable, read it
from the passed-in pointer as intended.

This fixes crashes on 64 bit Book-E.

Obtained from:	jhibbits

(cherry picked from commit 9941cb0657d63b4b1570dcf384196bb599bf9024)

Git Hash:   716baab384ded0d02bad67a4be52e9d2408ae636
Git Author: bdragon@FreeBSD.org
END