x86: time_64.c timer_interrupt() should be static

Impact: cleanup, reduce kernel size a bit
Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/time_64.c

@@ -49,7 +49,7 @@ unsigned long profile_pc(struct pt_regs *regs)
 }
 EXPORT_SYMBOL(profile_pc);
 
-irqreturn_t timer_interrupt(int irq, void *dev_id)
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
 	add_pda(irq0_irqs, 1);