perf/x86: Fix typo in uncore_pmu_to_box

The variable box should not be declared as static.

This could probably cause crashes with sufficiently parallel
uncore PMU use.
Signed-off-by: NYan, Zheng <zheng.z.yan@intel.com>
Cc: eranian@google.com
Cc: a.p.zijlstra@chello.nl
Link: http://lkml.kernel.org/r/1348709606-2759-1-git-send-email-zheng.z.yan@intel.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

arch/x86/kernel/cpu/perf_event_intel_uncore.c

@@ -1950,7 +1950,7 @@ struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type, int cp
 static struct intel_uncore_box *
 uncore_pmu_to_box(struct intel_uncore_pmu *pmu, int cpu)
 {
-	static struct intel_uncore_box *box;
+	struct intel_uncore_box *box;
 
 	box = *per_cpu_ptr(pmu->box, cpu);
 	if (box)