powerpc/pseries/cmm: Report errors when registering notifiers fails
If we don't set the rc, we will return "0", making it look like we succeeded. Signed-off-by:David Hildenbrand <david@redhat.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191031142933.10779-3-david@redhat.com
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7d821274
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