config: fixed rules parsing, cleanup

src/knot/conf/cf-parse.y

@@ -888,7 +888,7 @@ zone_synth_addr:
  ;
 
 zone_synth:
- | FORWARD TEXT zone_synth_addr zone_synth_ttl { synth_tpl_define(scanner, SYNTH_FORWARD, $2.t); }
+   FORWARD TEXT zone_synth_addr zone_synth_ttl { synth_tpl_define(scanner, SYNTH_FORWARD, $2.t); }
  | REVERSE TEXT zone_synth_addr zone_synth_ttl { synth_tpl_define(scanner, SYNTH_REVERSE, $2.t); }
  ;
 

src/knot/conf/conf.c

@@ -30,6 +30,7 @@
 #include "knot/conf/extra.h"
 #include "knot/knot.h"
 #include "knot/ctl/remote.h"
+#include "knot/nameserver/synth_record.h"
 
 /*
  * Defaults.
@@ -980,6 +981,13 @@ void conf_free_zone(conf_zone_t *zone)
 	WALK_LIST_FREE(zone->acl.notify_out);
 	WALK_LIST_FREE(zone->acl.update_in);
 
+	/* Free answer synthesis rule list. */
+	synth_template_t *tpl = NULL, *tpl_next = NULL;
+	WALK_LIST_DELSAFE(tpl, tpl_next, zone->synth_templates) {
+		free(tpl->format);
+		free(tpl);
+	}
+
 	free(zone->name);
 	free(zone->file);
 	free(zone->ixfr_db);