The first argument to the WARN() macro has to be a condition.  I'm sort
of disappointed that this code doesn't generate a compiler warning.  I
guess -Wformat-extra-args doesn't work in the kernel.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index de632da..9da0703 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -682,7 +682,7 @@ static int vfio_group_nb_add_dev(struct vfio_group *group, 
struct device *dev)
                return 0;
 
        /* TODO Prevent device auto probing */
-       WARN("Device %s added to live group %d!\n", dev_name(dev),
+       WARN(1, "Device %s added to live group %d!\n", dev_name(dev),
             iommu_group_id(group->iommu_group));
 
        return 0;
--
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