cls: avoid explicit free in nl_cli_cls_parse_ematch()

Author: thom311

src/lib/cls.c

@@ -50,16 +50,13 @@ void nl_cli_cls_parse_proto(struct rtnl_cls *cls, char *arg)
 
 struct rtnl_ematch_tree *nl_cli_cls_parse_ematch(struct rtnl_cls *cls, char *arg)
 {
+	_nl_auto_free char *errstr = NULL;
 	struct rtnl_ematch_tree *tree;
-	char *errstr = NULL;
 	int err;
 
 	if ((err = rtnl_ematch_parse_expr(arg, &errstr, &tree)) < 0)
 		nl_cli_fatal(err, "Unable to parse ematch expression: %s",
 				  errstr);
-	
-	if (errstr)
-		free(errstr);
 
 	return tree;
 }