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>

arch/ia64/hp/sim/simserial.c

@@ -714,7 +714,7 @@ startup(struct async_struct *info)
 {
 	unsigned long flags;
 	int	retval=0;
-	irqreturn_t (*handler)(int, void *);
+	irq_handler_t handler;
 	struct serial_state *state= info->state;
 	unsigned long page;