state: explicit callback to check pkt_open_complete.

For now, this always succeeds, but include the hook for completeness.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/packets.c

@@ -405,6 +405,12 @@ Pkt *accept_pkt_open_commit_sig(const tal_t *ctx,
 	return NULL;
 }
 
+Pkt *accept_pkt_open_complete(const tal_t *ctx,
+			      struct peer *peer, const Pkt *pkt)
+{
+	return NULL;
+}
+
 static Pkt *decline_htlc(const tal_t *ctx, const char *why)
 {
 	UpdateDeclineHtlc *d = tal(ctx, UpdateDeclineHtlc);