ia64/irq: Use access helper irq_data_get_affinity_mask()

This is a preparatory patch for moving irq_data struct members.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/20150713131034.630273860@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --cc arch/ia64/kernel/iosapic.c
Simple merge

diff --cc arch/ia64/kernel/irq.c
Simple merge

diff --cc arch/ia64/kernel/msi_ia64.c
Simple merge

diff --cc arch/ia64/sn/kernel/msi_sn.c
Simple merge