Merge pull request #2994 from c-po/init-T2044

init: T2044: fix "binary operator expected" when two or more RPKI caches are defined

src/init/vyos-router

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright (C) 2021 VyOS maintainers and contributors
+# Copyright (C) 2021-2024 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -449,7 +449,7 @@ start ()
 
     run_postconfig_scripts
     tmp=$(${vyos_libexec_dir}/read-saved-value.py --path "protocols rpki cache")
-    if [ ! -z $tmp ]; then
+    if [[ ! -z "$tmp" ]]; then
         vtysh -c "rpki start"
     fi
 }