sparc: Make SPARC use the new is_idle_task() API
Change from direct comparison of ->pid with zero to is_idle_task(). Signed-off-by: NPaul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NDavid S. Miller <davem@davemloft.net> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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