[POWERPC] spufs: Fix restore_decr_wrapped() to match CBE Handbook
Based on an original patch from Masato Noguchi <Masato.Noguchi@jp.sony.com>. We're currently not restoring the SPE decrementer as specified by the CBE handbook. This change fixes our implementation to match, and makes the function read more like the docs. Signed-off-by: NJeremy Kerr <jk@ozlabs.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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