x86: make init_ISA_irqs() static

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/i8259_64.c b/arch/x86/kernel/i8259_64.c
index b44095e..31f49e8 100644
--- a/arch/x86/kernel/i8259_64.c
+++ b/arch/x86/kernel/i8259_64.c
@@ -134,7 +134,7 @@
 	[IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
 };
 
-void __init init_ISA_irqs (void)
+static void __init init_ISA_irqs (void)
 {
 	int i;