[rhythmbox] shell: add missing return value

[Jonathan Matthew <jmatthew src gnome org>]

commit e5b3f0a3c27298fdf3f7f2d729412a54836b121c
Author: Jonathan Matthew <jonathan d14n org>
Date:   Sun Apr 7 08:02:28 2013 +1000

    shell: add missing return value

 shell/rb-shell.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/shell/rb-shell.c b/shell/rb-shell.c
index 8ab4766..3d256f7 100644
--- a/shell/rb-shell.c
+++ b/shell/rb-shell.c
@@ -2363,7 +2363,7 @@ rb_shell_quit (RBShell *shell,
        GdkDisplay *display;
 
        if (shell->priv->shutting_down)
-               return;
+               return TRUE;
        shell->priv->shutting_down = TRUE;
 
        rb_debug ("Quitting");