m68knommu: fix declaration of mach_sched_init

Make declaration of mach_sched_init match definition
(which is in arch/m68knommu/kernel/setup.c).
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-m68knommu/machdep.h

@@ -11,7 +11,7 @@ struct hwclk_time;
 struct gendisk;
 struct buffer_head;
 
-extern void (*mach_sched_init) (irqreturn_t (*handler)(int, void *, struct pt_regs *));
+extern void (*mach_sched_init) (irq_handler_t handler);
 /* machine dependent keyboard functions */
 extern int (*mach_keyb_init) (void);
 extern int (*mach_kbdrate) (struct kbd_repeat *);