x86: DS cleanup - dont treat 0 as NULL
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>