Remove duplicated code from AtkImage

Fixes bug #571622.

diff --git a/atk/atkimage.c b/atk/atkimage.c
index 2f9edea..78fcebd 100755 (executable)
--- a/atk/atkimage.c
+++ b/atk/atkimage.c
@@ -169,10 +169,6 @@ atk_image_get_image_position (AtkImage *image,
     real_y = y;
   else
     real_y = &local_y;
-  
-  iface = ATK_IMAGE_GET_IFACE (image);
-
-  g_return_if_fail (ATK_IS_IMAGE (image));
 
   iface = ATK_IMAGE_GET_IFACE (image);