[gnome-builder] build: fix warning

[Christian Hergert <chergert src gnome org>]

commit 7d092b86cd132d272a0af30ad204168fcc673ed0
Author: Christian Hergert <christian hergert me>
Date:   Mon Apr 13 15:02:03 2015 -0700

    build: fix warning

 src/app/gb-application.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/app/gb-application.c b/src/app/gb-application.c
index a5be57c..2420043 100644
--- a/src/app/gb-application.c
+++ b/src/app/gb-application.c
@@ -560,7 +560,7 @@ gb_application_init (GbApplication *app)
       NULL,
       N_("Run Builder in standalone mode") },
     { "version",
-      NULL,
+      0,
       G_OPTION_FLAG_IN_MAIN,
       G_OPTION_ARG_NONE,
       NULL,