[IA64] Correct definition of handle_IPI

The declaration of handle_IPI in arch/ia64/kernel/smp.c was changed but
not the definition of this function.  Remove struct pt_regs from
handle_IPI().
Signed-off-by: NKeith Owens <kaos@sgi.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/kernel/smp.c

@@ -108,7 +108,7 @@ cpu_die(void)
 }
 
 irqreturn_t
-handle_IPI (int irq, void *dev_id, struct pt_regs *regs)
+handle_IPI (int irq, void *dev_id)
 {
 	int this_cpu = get_cpu();
 	unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);