channeld: don't allow NULL htlcmap for full_channel

That was only for the initial state, which is now in initial_channel.c.

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

channeld/full_channel.c

@@ -250,10 +250,6 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
 	/* Figure out what @side will already be committed to. */
 	gather_htlcs(ctx, channel, side, &committed, NULL, NULL);
 
-	/* NULL map only allowed at beginning, when we know no HTLCs */
-	if (!htlcmap)
-		assert(tal_count(committed) == 0);
-
 	txs = tal_arr(ctx, struct bitcoin_tx *, 1);
 	txs[0] = commit_tx(ctx, &channel->funding_txid,
 		       channel->funding_txout,
@@ -275,8 +271,7 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
 					     &channel->funding_pubkey[side],
 					     &channel->funding_pubkey[!side]);
 
-	if (htlcmap)
-		add_htlcs(&txs, wscripts, *htlcmap, channel, &keyset, side);
+	add_htlcs(&txs, wscripts, *htlcmap, channel, &keyset, side);
 
 	tal_free(committed);
 	return txs;

channeld/full_channel.h

@@ -43,16 +43,15 @@ struct channel *new_channel(const tal_t *ctx,
  * channel_txs: Get the current commitment and htlc txs for the channel.
  * @ctx: tal context to allocate return value from.
  * @channel: The channel to evaluate
- * @htlc_map: Pointer to htlcs for each tx output (allocated off @ctx) or NULL.
+ * @htlc_map: Pointer to htlcs for each tx output (allocated off @ctx).
  * @wscripts: Pointer to array of wscript for each tx returned (alloced off @ctx)
  * @per_commitment_point: Per-commitment point to determine keys
  * @commitment_number: The index of this commitment.
  * @side: which side to get the commitment transaction for
  *
  * Returns the unsigned commitment transaction for the committed state
- * for @side, followed by the htlc transactions in output order, and
- * fills in @htlc_map (if not NULL), or NULL on key derivation
- * failure.
+ * for @side, followed by the htlc transactions in output order and
+ * fills in @htlc_map, or NULL on key derivation failure.
  */
 struct bitcoin_tx **channel_txs(const tal_t *ctx,
 				const struct htlc ***htlcmap,