pay: Add channel_hint_set_count primitive

plugins/channel_hint.c

@@ -205,3 +205,8 @@ void channel_hint_set_update(struct channel_hint_set *set,
 	for (size_t i = 0; i < tal_count(set->hints); i++)
 		channel_hint_update(time_now(), &set->hints[i]);
 }
+
+size_t channel_hint_set_count(const struct channel_hint_set *set)
+{
+	return tal_count(set->hints);
+}

plugins/channel_hint.h

@@ -87,4 +87,9 @@ struct channel_hint *channel_hint_set_add(struct channel_hint_set *self,
 					  const struct amount_sat overall_capacity,
 					  u16 *htlc_budget);
 
+/**
+ * Count how many channel_hints the set contains.
+ */
+size_t channel_hint_set_count(const struct channel_hint_set *set);
+
 #endif /* LIGHTNING_PLUGINS_CHANNEL_HINT_H */

plugins/libplugin-pay.c

@@ -160,10 +160,6 @@ struct payment *payment_new(tal_t *ctx, struct command *cmd,
 			tal_arr_expand(&p->modifier_data, NULL);
 	}
 
-	paymod_log(p, LOG_DBG,
-		   "Initialized a new (sub-)payment with %zu channel_hints",
-		   tal_count(payment_root(p)->hints->hints));
-
 	return p;
 }