[glib] Fix a return_if_fail confusion

[Matthias Clasen <matthiasc src gnome org>]

commit 58ec89ea7c86f9b61ae4a0017019e19f09a1542f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 11 15:53:13 2014 -0400

    Fix a return_if_fail confusion
    
    This slipped through my editing of the patch.

 gobject/gtype.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gobject/gtype.c b/gobject/gtype.c
index a11ef27..dc58524 100644
--- a/gobject/gtype.c
+++ b/gobject/gtype.c
@@ -3847,7 +3847,7 @@ g_type_get_instance_count (GType type)
   TypeNode *node;
 
   node = lookup_type_node_I (type);
-  g_return_if_fail (node != NULL);
+  g_return_val_if_fail (node != NULL, 0);
 
   return g_atomic_int_get (&node->instance_count);
 #else