sparc64: ensure VIO operations are defined while being used
It's possible that VIO operations are not defined for some VIO clients. In that case, VIO ops pointer should be checked for NULL before being used Signed-off-by: NJagannathan Raman <jag.raman@oracle.com> Reviewed-by: NLiam Merwick <liam.merwick@oracle.com> Reviewed-by: NShannon Nelson <shannon.nelson@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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