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Fix an invalid memory reference problem when cpu hotplug support is disabled and the hw-branch-tracer is set as current tracer. Initializing the tracer calls bts_trace_init() which has already been freed at this time. Reported-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>