at startup initialize smoothed feerate to polled feerate

fix indentation

lightningd/chaintopology.c

@@ -253,6 +253,11 @@ static void update_feerates(struct bitcoind *bitcoind,
 		if (!feerate)
 			continue;
 
+		/* Initial smoothed feerate is the polled feerate */
+		if (topo->startup) {
+			old_feerates[i] = feerate;
+		}
+
 		/* Smooth the feerate to avoid spikes. */
 		u32 feerate_smooth = feerate * alpha + old_feerates[i] * (1 - alpha);
 		/* But to avoid updating forever, only apply smoothing when its
@@ -278,6 +283,9 @@ static void update_feerates(struct bitcoind *bitcoind,
 		}
 		topo->feerate[i] = feerate;
 	}
+	/* Moving this forward in time is ok, but feerate smoothing is effectively
+	 * disabled until topo->startup is set to false */
+	topo->startup = false;
 
 	/* Make sure fee rates are in order. */
 	for (size_t i = 0; i < NUM_FEERATES; i++) {
@@ -685,6 +693,7 @@ struct chain_topology *new_topology(struct lightningd *ld, struct log *log)
 	topo->bitcoind = new_bitcoind(topo, ld, log);
 	topo->wallet = ld->wallet;
 	topo->poll_seconds = 30;
+	topo->startup = true;
 #if DEVELOPER
 	topo->dev_override_fee_rate = NULL;
 #endif