Fix zonedb reload related leaks

Test for and repair a memory leak that caused by reuse_member_zone().

src/knot/zone/zonedb-load.c

@@ -32,6 +32,9 @@
 #include "knot/zone/zonefile.h"
 #include "libknot/libknot.h"
 
+#define FULL(conf) (!((conf)->io.flags & CONF_IO_FACTIVE) || \
+                     ((conf)->io.flags & CONF_IO_FRLD_ZONES))
+
 static bool zone_file_updated(conf_t *conf, const zone_t *old_zone,
                               const knot_dname_t *zone_name)
 {
@@ -294,6 +297,8 @@ static zone_t *reuse_member_zone(zone_t *zone, server_t *server, conf_t *conf,
 		return NULL;
 	}
 
+	bool full = FULL(conf);
+
 	catalog_upd_val_t *upd = catalog_update_get(&server->catalog_upd, zone->name);
 	if (upd != NULL) {
 		switch (upd->type) {
@@ -308,6 +313,9 @@ static zone_t *reuse_member_zone(zone_t *zone, server_t *server, conf_t *conf,
 		default:
 			break;
 		}
+	} else if (!full) {
+		printf("REUSE\n"); // TODO remove
+		return zone;
 	}
 
 	zone_t *newzone = create_zone(conf, zone->name, server, zone);
@@ -318,6 +326,7 @@ static zone_t *reuse_member_zone(zone_t *zone, server_t *server, conf_t *conf,
 		conf_activate_modules(conf, server, newzone->name, &newzone->query_modules,
 		                      &newzone->query_plan);
 	}
+
 	return newzone;
 }
 
@@ -412,8 +421,7 @@ static knot_zonedb_t *create_zonedb(conf_t *conf, server_t *server, list_t *expi
 		return NULL;
 	}
 
-	bool full = !(conf->io.flags & CONF_IO_FACTIVE) ||
-	            (conf->io.flags & CONF_IO_FRLD_ZONES);
+	bool full = FULL(conf);
 
 	/* Mark changed zones. */
 	if (!full) {
@@ -502,8 +510,7 @@ static void remove_old_zonedb(conf_t *conf, knot_zonedb_t *db_old,
 
 	knot_zonedb_t *db_new = server->zone_db;
 
-	bool full = !(conf->io.flags & CONF_IO_FACTIVE) ||
-	            (conf->io.flags & CONF_IO_FRLD_ZONES);
+	bool full = FULL(conf);
 
 	if (db_old == NULL) {
 		goto catalog_only;