sched: Avoid NULL dereference on sd_busy
Commit 37dc6b50 ("sched: Remove unnecessary iteration over sched domains to update nr_busy_cpus") forgot to clear 'sd_busy' under some conditions leading to a possible NULL deref in set_cpu_sd_state_idle(). Reported-by: NAnton Blanchard <anton@samba.org> Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20131118113701.GF3866@twins.programming.kicks-ass.netSigned-off-by: NIngo Molnar <mingo@kernel.org>
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