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/nfc/af_nfc.c b/net/nfc/af_nfc.c
index 54e40fa..d3e594e 100644
--- a/net/nfc/af_nfc.c
+++ b/net/nfc/af_nfc.c
@@ -48,7 +48,7 @@ static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
 	return rc;
 }
 
-static struct net_proto_family nfc_sock_family_ops = {
+static const struct net_proto_family nfc_sock_family_ops = {
 	.owner  = THIS_MODULE,
 	.family = PF_NFC,
 	.create = nfc_sock_create,