[libgd] build: Fix -Wreturn-type warnings

[Christian Persch <chpe src gnome org>]

commit 67b887bd4f7c9d11f6eefc360a03b6e3a47b5369
Author: Christian Persch <chpe gnome org>
Date:   Wed Feb 13 12:31:32 2013 +0100

    build: Fix -Wreturn-type warnings

 libgd/gd-stack.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libgd/gd-stack.c b/libgd/gd-stack.c
index 765e3c7..79b844c 100644
--- a/libgd/gd-stack.c
+++ b/libgd/gd-stack.c
@@ -607,7 +607,7 @@ gd_stack_set_homogeneous (GdStack *stack,
 gboolean
 gd_stack_get_homogeneous (GdStack *stack)
 {
-  g_return_if_fail (stack != NULL);
+  g_return_val_if_fail (stack != NULL, FALSE);
 
   return stack->priv->homogeneous;
 }
@@ -643,7 +643,7 @@ gd_stack_set_duration (GdStack *stack,
 GtkWidget *
 gd_stack_get_visible_child (GdStack *stack)
 {
-  g_return_if_fail (stack != NULL);
+  g_return_val_if_fail (stack != NULL, NULL);
 
   return stack->priv->visible_child->widget;
 }