sh/irq: Use accessor irq_data_get_node()

Use accessor irq_data_get_node() to hide struct irq_data
implementation detail, so we can move irq_data->node to
irq_data_common once all usage sites are fixed.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Link: http://lkml.kernel.org/r/20150713151626.519112900@linutronix.deSigned-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/sh/kernel/irq.c

@@ -227,7 +227,7 @@ void migrate_irqs(void)
 	for_each_active_irq(irq) {
 		struct irq_data *data = irq_get_irq_data(irq);
 
-		if (data->node == cpu) {
+		if (irq_data_get_node(data) == cpu) {
 			unsigned int newcpu = cpumask_any_and(data->affinity,
 							      cpu_online_mask);
 			if (newcpu >= nr_cpu_ids) {