net: Make static

Sparse asked whether these could be static.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 424d86a..daf2b98 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -1106,7 +1106,7 @@
 	add_timer(&dn_db->timer);
 }
 
-struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
+static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
 {
 	int i;
 	struct dn_dev_parms *p = dn_dev_list;