[PATCH 16/21] powerpc: Add missing prototype for init_IRQ

A function init_IRQ was added without a prototype declared in header irq.h.
Fix the following warning (treated as error in W=1):

  CC      arch/powerpc/kernel/irq.o
arch/powerpc/kernel/irq.c:662:13: error: no previous prototype for ‘init_IRQ’ [-Werror=missing-prototypes]
 void __init init_IRQ(void)
             ^~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Mathieu Malaterre <redacted>
---
 arch/powerpc/include/asm/irq.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h
index e8e3a0a04eb0..ee39ce56b2a2 100644
--- a/arch/powerpc/include/asm/irq.h
+++ b/arch/powerpc/include/asm/irq.h

@@ -66,6 +66,7 @@ extern void irq_ctx_init(void);
 extern void call_do_softirq(struct thread_info *tp);
 extern void call_do_irq(struct pt_regs *regs, struct thread_info *tp);
 extern void do_IRQ(struct pt_regs *regs);
+extern void __init init_IRQ(void);
 extern void __do_irq(struct pt_regs *regs);
 
 int irq_choose_cpu(const struct cpumask *mask);

-- 
2.11.0