Add missing module license tag to vring helpers.

[Dave Jones]

[  624.286653] vringh: module license 'unspecified' taints kernel.

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index bff0775..5174eba 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -3,6 +3,7 @@
  *
  * Since these may be in userspace, we use (inline) accessors.
  */
+#include <linux/module.h>
 #include <linux/vringh.h>
 #include <linux/virtio_ring.h>
 #include <linux/kernel.h>
@@ -1005,3 +1006,5 @@ int vringh_need_notify_kern(struct vringh *vrh)
 	return __vringh_need_notify(vrh, getu16_kern);
 }
 EXPORT_SYMBOL(vringh_need_notify_kern);
+
+MODULE_LICENSE("GPL");
--
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