Blackfin arch: dont export ack_bad_irq as no one else does

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/irqchip.c

@@ -51,7 +51,6 @@ void ack_bad_irq(unsigned int irq)
 	atomic_inc(&irq_err_count);
 	printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
 }
-EXPORT_SYMBOL(ack_bad_irq);
 
 static struct irq_chip bad_chip = {
 	.ack = dummy_mask_unmask_irq,