utxo: fill in scriptPubkey to NULL

We need this so we can access it when populating bitcoin inputs in the
next commit

common/test/run-funding_tx.c

@@ -177,6 +177,7 @@ int main(int argc, const char *argv[])
 	utxo.amount = AMOUNT_SAT(5000000000);
 	utxo.is_p2sh = false;
 	utxo.close_info = NULL;
+	utxo.scriptPubkey = NULL;
 	funding_sat = AMOUNT_SAT(10000000);
 	fee = AMOUNT_SAT(13920);
 

lightningd/onchain_control.c

@@ -334,6 +334,7 @@ static void onchain_add_utxo(struct channel *channel, const u8 *msg)
 	u->close_info->channel_id = channel->dbid;
 	u->close_info->peer_id = channel->peer->id;
 	u->spendheight = NULL;
+	u->scriptPubkey = NULL;
 
 	if (!fromwire_onchain_add_utxo(
 		u, msg, &u->txid, &u->outnum, &u->close_info->commitment_point,