use pfree() instead of free()

src/pg_query_parse_summary.c

@@ -272,7 +272,7 @@ PgQueryError* pg_query_parse_summary_walk(Summary* summary, Node* tree) {
 				ts->name = pg_query_range_var_to_name(rv);
 				ts->type = rvt->type;
 				ts->rangevar = rv;
-				free(rvt);
+				pfree(rvt);
 				printf("lc_node is a RangeVar (%s)\n", ts->name);
 				break;
 			}