ia64: cpumask fix for is_affinity_mask_valid()

Impact: build fix on ia64

ia64's default_affinity_write() still had old cpumask_t usage:

 /home/mingo/tip/kernel/irq/proc.c: In function `default_affinity_write':
 /home/mingo/tip/kernel/irq/proc.c:114: error: incompatible type for argument 1 of `is_affinity_mask_valid'
 make[3]: *** [kernel/irq/proc.o] Error 1
 make[3]: *** Waiting for unfinished jobs....

update it to cpumask_var_t.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 2abd3a7..aae3f74 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -54,7 +54,7 @@
 	if (err)
 		goto free_cpumask;
 
-	if (!is_affinity_mask_valid(*new_value)) {
+	if (!is_affinity_mask_valid(new_value)) {
 		err = -EINVAL;
 		goto free_cpumask;
 	}