[gimp/gimp-2-10] app: print gimp_versions.json parsing error on stderr.

[Jehan <jehanp src gnome org>]

commit dd4cec577dd146720ccebd99e33618177773d5d2
Author: Jehan <jehan girinstud io>
Date:   Mon Mar 30 14:40:20 2020 +0200

    app: print gimp_versions.json parsing error on stderr.
    
    Do it even on stable builds as it can help diagnose bugs on releases.
    Note that the issue we had just know with casing on the build-id would
    not have been seen by such stderr output anyway. Just in case for future
    issues.

 app/gimp-update.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/app/gimp-update.c b/app/gimp-update.c
index 4ee1ce6127..f64a5442fa 100644
--- a/app/gimp-update.c
+++ b/app/gimp-update.c
@@ -115,10 +115,8 @@ gimp_check_updates_callback (GObject      *source,
       parser = json_parser_new ();
       if (! json_parser_load_from_stream (parser, G_INPUT_STREAM (stream), NULL, &error))
         {
-#ifdef GIMP_UNSTABLE
-          g_printerr("Parsing of %s failed: %s\n",
+          g_printerr("%s: parsing of %s failed: %s\n", G_STRFUNC,
                      g_file_get_uri (G_FILE (source)), error->message);
-#endif
           g_clear_object (&stream);
           g_clear_object (&parser);
           g_clear_error (&error);