dualopend: fix channel_type if we don't negotiate the default.

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

lightningd/dual_open_control.c

@@ -3312,6 +3312,7 @@ static void handle_psbt_changed(struct subd *dualopend,
 	struct openchannel2_psbt_payload *payload;
 	struct open_attempt *oa;
 	struct command *cmd;
+	struct channel_type *channel_type;
 
 	assert(channel->open_attempt);
 	oa = channel->open_attempt;
@@ -3321,13 +3322,17 @@ static void handle_psbt_changed(struct subd *dualopend,
 					     &cid,
 					     &channel->req_confirmed_ins[REMOTE],
 					     &funding_serial,
-					     &psbt)) {
+					     &psbt,
+					     &channel_type)) {
 		channel_internal_error(channel,
 				       "Bad DUALOPEND_PSBT_CHANGED: %s",
 				       tal_hex(tmpctx, msg));
 		return;
 	}
 
+	/* This is often the first time we hear about channel details */
+	tal_free(channel->type);
+	channel->type = tal_steal(channel, channel_type);
 
 	switch (oa->role) {
 	case TX_INITIATOR:

openingd/dualopend.c

@@ -1439,7 +1439,7 @@ fetch_psbt_changes(struct state *state,
 	msg = towire_dualopend_psbt_changed(NULL, &state->channel_id,
 					    state->require_confirmed_inputs[REMOTE],
 					    tx_state->funding_serial,
-					    psbt);
+					    psbt, state->channel_type);
 
 	wire_sync_write(REQ_FD, take(msg));
 

openingd/dualopend_wire.csv

@@ -180,6 +180,7 @@ msgdata,dualopend_psbt_changed,channel_id,channel_id,
 msgdata,dualopend_psbt_changed,requires_confirmed_inputs,bool,
 msgdata,dualopend_psbt_changed,funding_serial,u64,
 msgdata,dualopend_psbt_changed,psbt,wally_psbt,
+msgdata,dualopend_psbt_changed,channel_type,channel_type,
 
 # master->dualopend: we updated the psbt
 msgtype,dualopend_psbt_updated,7108