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/mips/au1000/common/irq.c b/arch/mips/au1000/common/irq.c
index b32597e..2abe132 100644
--- a/arch/mips/au1000/common/irq.c
+++ b/arch/mips/au1000/common/irq.c
@@ -288,7 +288,7 @@
 };
 
 #ifdef CONFIG_PM
-void startup_match20_interrupt(irqreturn_t (*handler)(int, void *))
+void startup_match20_interrupt(irq_handler_t handler)
 {
 	struct irq_desc *desc = &irq_desc[AU1000_TOY_MATCH2_INT];