netfilter: decnet: use NFPROTO values for NF_HOOK invocation

The semantic patch used was:
// <smpl>
@@
@@
 NF_HOOK(
-PF_DECnet,
+NFPROTO_DECNET,
 ...)
// </smpl>

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/net/decnet/dn_nsp_in.c b/net/decnet/dn_nsp_in.c
index 932408d..65531ad 100644
--- a/net/decnet/dn_nsp_in.c
+++ b/net/decnet/dn_nsp_in.c
@@ -809,7 +809,8 @@
 
 int dn_nsp_rx(struct sk_buff *skb)
 {
-	return NF_HOOK(PF_DECnet, NF_DN_LOCAL_IN, skb, skb->dev, NULL, dn_nsp_rx_packet);
+	return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_IN, skb, skb->dev, NULL,
+		       dn_nsp_rx_packet);
 }
 
 /*