x86: irqinit_64.c init_ISA_irqs should be static

Signed-off-by: NJaswinder Singh <jaswinder@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/irqinit_64.c

@@ -81,7 +81,7 @@ int vector_used_by_percpu_irq(unsigned int vector)
 	return 0;
 }
 
-void __init init_ISA_irqs(void)
+static void __init init_ISA_irqs(void)
 {
 	int i;