net: socket: mark socket protocol handler structs as const

Signed-off-by: linzhang <xiaolou4617@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 42d0997..8a8f77a 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -733,7 +733,7 @@
 EXPORT_SYMBOL(bt_procfs_init);
 EXPORT_SYMBOL(bt_procfs_cleanup);
 
-static struct net_proto_family bt_sock_family_ops = {
+static const struct net_proto_family bt_sock_family_ops = {
 	.owner	= THIS_MODULE,
 	.family	= PF_BLUETOOTH,
 	.create	= bt_sock_create,