ia64: sn: Use kmemdup rather than duplicating its implementation

---
 arch/ia64/sn/kernel/irq.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
 
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 485c42d..dfac09a 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -150,12 +150,11 @@ struct sn_irq_info *sn_retarget_vector(struct sn_irq_info *sn_irq_info,
 	 * PROM does not support SAL_INTR_REDIRECT, or it failed.
 	 * Revert to old method.
 	 */
-	new_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_ATOMIC);
+	new_irq_info = kmemdup(sn_irq_info, sizeof(struct sn_irq_info),
+			       GFP_ATOMIC);
 	if (new_irq_info == NULL)
 		return NULL;
 
-	memcpy(new_irq_info, sn_irq_info, sizeof(struct sn_irq_info));
-
 	/* Free the old PROM new_irq_info structure */
 	sn_intr_free(local_nasid, local_widget, new_irq_info);
 	unregister_intr_pda(new_irq_info);