[gnome-panel] main: use symbolic return value

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 2f9df2030d4fde057a7ab28371c89f7dead58850
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sat Jan 6 09:38:27 2018 +0100

    main: use symbolic return value

 gnome-panel/main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnome-panel/main.c b/gnome-panel/main.c
index aee2378..3f3ad06 100644
--- a/gnome-panel/main.c
+++ b/gnome-panel/main.c
@@ -155,7 +155,7 @@ main (int argc, char **argv)
                g_error_free (error);
                g_option_context_free (context);
 
-               return 1;
+               return EXIT_FAILURE;
        }
 
        g_option_context_free (context);