update-gre-address: use $ExitError to indicate unintentional error

update-gre-address.rsc

@@ -12,6 +12,7 @@
 :global GlobalFunctionsReady;
 :while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
 
+:local ExitOK false;
 :do {
   :local ScriptName [ :jobname ];
 
@@ -20,6 +21,7 @@
   :global ScriptLock; 
 
   :if ([ $ScriptLock $ScriptName ] = false) do={
+    :set ExitOK true;
     :error false;
   }
 
@@ -39,4 +41,6 @@
       }
     }
   }
-} on-error={ }
+} on-error={
+  :global ExitError; $ExitError $ExitOK [ :jobname ];
+}