Use iterator if possible

src/set/set.c

@@ -47,10 +47,8 @@ setDtor(void * _this)
 	size_t  i;
 
 	if (this->free_msgs) {
-		for (i = 0; i < this->used; i++) {
-			if (this->data[i]) {
-				TR_delete(this->data[i]);
-			}
+		TR_iterableForeach(this) {
+			TR_delete(this->data[i]);
 		}
 	}