[gtk+] Return a value from ::command-line handler

[Matthias Clasen <matthiasc src gnome org>]

commit a9b069524c0e50e7b365e7fed7b4d6c8b59334ef
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 28 06:28:51 2015 -0400

    Return a value from ::command-line handler
    
    The signal expects a return value, so give it one.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755692

 demos/gtk-demo/main.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/main.c b/demos/gtk-demo/main.c
index 512221d..8e25adc 100644
--- a/demos/gtk-demo/main.c
+++ b/demos/gtk-demo/main.c
@@ -1073,7 +1073,7 @@ list_demos (void)
     }
 }
 
-static void
+static gint
 command_line (GApplication            *app,
               GApplicationCommandLine *cmdline)
 {
@@ -1096,7 +1096,7 @@ command_line (GApplication            *app,
     {
       list_demos ();
       g_application_quit (app);
-      return;
+      return 0;
     }
 
   if (name == NULL)
@@ -1137,6 +1137,8 @@ out:
 
   if (autoquit)
     g_timeout_add_seconds (1, auto_quit, app);
+
+  return 0;
 }
 
 int