x86: irqinit_64.c init_ISA_irqs should be static

Signed-off-by: Jaswinder Singh <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/kernel/irqinit_64.c

···
 	return 0;
 }
 
-void __init init_ISA_irqs(void)
+static void __init init_ISA_irqs(void)
 {
 	int i;