proper show_interrupts() prototype

Add a proper prototype for show_interrupts() in include/linux/interrupt.h

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/h8300/kernel/irq.c b/arch/h8300/kernel/irq.c
index 8dec4dd..5a1b4cf 100644
--- a/arch/h8300/kernel/irq.c
+++ b/arch/h8300/kernel/irq.c
@@ -14,6 +14,7 @@
 #include <linux/random.h>
 #include <linux/bootmem.h>
 #include <linux/irq.h>
+#include <linux/interrupt.h>
 
 #include <asm/system.h>
 #include <asm/traps.h>