irqchip/mips-gic: Use access helper irq_data_get_affinity_mask()

Use access helper irq_data_get_affinity_mask() to hide implementation
details of struct irq_desc.

[ tglx: Verified with coccinelle ]

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1433145945-789-30-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/irqchip/irq-mips-gic.c

@@ -405,7 +405,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 		clear_bit(irq, pcpu_masks[i].pcpu_mask);
 	set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
 
-	cpumask_copy(d->affinity, cpumask);
+	cpumask_copy(irq_data_get_affinity_mask(d), cpumask);
 	spin_unlock_irqrestore(&gic_lock, flags);
 
 	return IRQ_SET_MASK_OK_NOCOPY;