vfio/platform: Disable virqfds on cleanup

irqfds for mask and unmask that are not specifically disabled by the
user are leaked. Remove any irqfds during cleanup

Cc: Eric Auger <[e-mail]>
Cc: <[e-mail]>
Fixes: a7fa7c77cf15 ("vfio/platform: implement IRQ masking/unmasking via an eventfd")
Reviewed-by: Kevin Tian <[e-mail]>
Reviewed-by: Eric Auger <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alex Williamson <[e-mail]>

drivers/vfio/platform/vfio_platform_irq.c

···
 {
 	int i;
 
-	for (i = 0; i < vdev->num_irqs; i++)
+	for (i = 0; i < vdev->num_irqs; i++) {
+		vfio_virqfd_disable(&vdev->irqs[i].mask);
+		vfio_virqfd_disable(&vdev->irqs[i].unmask);
 		vfio_set_trigger(vdev, i, -1, NULL);
+	}
 
 	vdev->num_irqs = 0;
 	kfree(vdev->irqs);