[MIPS] A few more pt_regs fixups.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/oprofile/op_model_rm9000.c

@@ -80,8 +80,7 @@ static void rm9000_cpu_stop(void *args)
 	write_c0_perfcontrol(0);
 }
 
-static irqreturn_t rm9000_perfcount_handler(int irq, void * dev_id,
-	struct pt_regs *regs)
+static irqreturn_t rm9000_perfcount_handler(int irq, void * dev_id)
 {
 	unsigned int control = read_c0_perfcontrol();
 	uint32_t counter1, counter2;