upstream: fix minor memory leak in Subsystem option parsing; from

Antonio Larrosa via GHPR515

OpenBSD-Commit-ID: fff3bbefd1b2c45c98cbe45c6b857b15d8a2d364

servconf.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: servconf.c,v 1.412 2024/07/25 23:44:01 djm Exp $ */
+/* $OpenBSD: servconf.c,v 1.413 2024/08/17 08:23:04 djm Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
  *                    All rights reserved
@@ -1933,6 +1933,7 @@ process_server_config_line_depth(ServerOptions *options, char *line,
 		xasprintf(&options->subsystem_args[options->num_subsystems],
 		    "%s%s%s", arg, *arg2 == '\0' ? "" : " ", arg2);
 		free(arg2);
+		free(arg);
 		argv_consume(&ac);
 		options->num_subsystems++;
 		break;