IRQ: Use the new typedef for interrupt handler function pointers

Use the new typedef for interrupt handler function pointers rather than
actually spelling out the full thing each time.  This was scripted with the
following small shell script:

#!/bin/sh
egrep -nHrl -e 'irqreturn_t[ 	]*[(][*]' $* |
while read i
do
    echo $i
    perl -pi -e 's/irqreturn_t\s*[(]\s*[*]\s*([_a-zA-Z0-9]*)\s*[)]\s*[(]\s*int\s*,\s*void\s*[*]\s*[)]/irq_handler_t \1/g' $i || exit $?
done

Signed-Off-By: David Howells <dhowells@redhat.com>
diff --git a/arch/m68k/q40/config.c b/arch/m68k/q40/config.c
index 5123f69..92f873c 100644
--- a/arch/m68k/q40/config.c
+++ b/arch/m68k/q40/config.c
@@ -39,7 +39,7 @@
 extern void q40_init_IRQ (void);
 static void q40_get_model(char *model);
 static int  q40_get_hardware_list(char *buffer);
-extern void q40_sched_init(irqreturn_t (*handler)(int, void *));
+extern void q40_sched_init(irq_handler_t handler);
 
 extern unsigned long q40_gettimeoffset (void);
 extern int q40_hwclk (int, struct rtc_time *);