iommu/hyper-v: Use helper instead of directly accessing affinity

Recent changes to solve inconsistencies in handling IRQ masks #ifdef
out the affinity field in irq_common_data for non-SMP configurations.
The current code in hyperv_irq_remapping_alloc() gets a compiler error
in that case.

Fix this by using the new irq_data_update_affinity() helper, which
handles the non-SMP case correctly.

Signed-off-by: Michael Kelley <[e-mail]>
Reported-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Acked-by: Joerg Roedel <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Fixes: aa0813581b8d ("genirq: Provide an IRQ affinity mask in non-SMP configs")
Link: https://lore.kernel.org/r/[e-mail]

drivers/iommu/hyperv-iommu.c

···
 {
 	struct irq_alloc_info *info = arg;
 	struct irq_data *irq_data;
-	struct irq_desc *desc;
 	int ret = 0;
 
 	if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)
···
 	 * Hypver-V IO APIC irq affinity should be in the scope of
 	 * ioapic_max_cpumask because no irq remapping support.
 	 */
-	desc = irq_data_to_desc(irq_data);
-	cpumask_copy(desc->irq_common_data.affinity, &ioapic_max_cpumask);
+	irq_data_update_affinity(irq_data, &ioapic_max_cpumask);
 
 	return 0;
 }