[gupnp] Fix build failure for lack of return value

[Jens Georg <jensgeorg src gnome org>]

commit 5550411614b06b06f69d66d609b06da79e4e4091
Author: Stef Walter <stefw gnome org>
Date:   Mon Nov 5 11:05:57 2012 +0100

    Fix build failure for lack of return value
    
    https://bugzilla.gnome.org/show_bug.cgi?id=687621

 libgupnp/gupnp-context-manager.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgupnp/gupnp-context-manager.c b/libgupnp/gupnp-context-manager.c
index 45f6252..709f6d5 100644
--- a/libgupnp/gupnp-context-manager.c
+++ b/libgupnp/gupnp-context-manager.c
@@ -430,7 +430,7 @@ gupnp_context_manager_manage_root_device (GUPnPContextManager *manager,
 guint
 gupnp_context_manager_get_port (GUPnPContextManager *manager)
 {
-        g_return_if_fail (GUPNP_IS_CONTEXT_MANAGER (manager));
+        g_return_val_if_fail (GUPNP_IS_CONTEXT_MANAGER (manager), 0);
 
         return manager->priv->port;
 }