Fix size as input/output parameter for various xglGet calls.
diff --git a/tests/xgltestframework.cpp b/tests/xgltestframework.cpp
index 4ef5ccf..311f1ec 100644
--- a/tests/xgltestframework.cpp
+++ b/tests/xgltestframework.cpp
@@ -103,7 +103,7 @@
         XGL_IMAGE_ASPECT_COLOR, 0, 0
     };
     XGL_SUBRESOURCE_LAYOUT sr_layout;
-    XGL_UINT data_size;
+    XGL_UINT data_size = sizeof(sr_layout);
 
     err = xglGetImageSubresourceInfo( image->image(), &sr,
                                       XGL_INFO_TYPE_SUBRESOURCE_LAYOUT,
@@ -167,7 +167,7 @@
         XGL_IMAGE_ASPECT_COLOR, 0, 0
     };
     XGL_SUBRESOURCE_LAYOUT sr_layout;
-    XGL_UINT data_size;
+    XGL_UINT data_size = sizeof(sr_layout);
 
     if (!m_show_images) return;