[glib] Simplify g_param_spec_get_redirect_target

[Matthias Clasen <matthiasc src gnome org>]

commit f1f80111c9bb691c658e8657c450845387cbefd1
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 7 02:33:50 2015 -0400

    Simplify g_param_spec_get_redirect_target
    
    There is no need to do a type check in a g_return_if_fail if the
    type check is tne next thing the function does anyway.

 gobject/gparam.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)
---
diff --git a/gobject/gparam.c b/gobject/gparam.c
index 677f16c..bf2028e 100644
--- a/gobject/gparam.c
+++ b/gobject/gparam.c
@@ -579,14 +579,8 @@ g_param_spec_steal_qdata (GParamSpec *pspec,
 GParamSpec*
 g_param_spec_get_redirect_target (GParamSpec *pspec)
 {
-  g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
-
   if (G_IS_PARAM_SPEC_OVERRIDE (pspec))
-    {
-      GParamSpecOverride *ospec = G_PARAM_SPEC_OVERRIDE (pspec);
-
-      return ospec->overridden;
-    }
+    return ((GParamSpecOverride*)pspec)->overridden;
   else
     return NULL;
 }