netdevsim: declare struct device_type as static

struct device_type nsim_dev_type created for SR-IOV support
should be static.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/netdev.c

@@ -139,7 +139,7 @@ static void nsim_dev_release(struct device *dev)
 	free_netdev(ns->netdev);
 }
 
-struct device_type nsim_dev_type = {
+static struct device_type nsim_dev_type = {
 	.groups = nsim_dev_attr_groups,
 	.release = nsim_dev_release,
 };