loader: Change sample code to not include a pointer.

It could imply that the ICD needs to allocate space for it.  The pointer is
really to be owned by the loader.
diff --git a/loader/README.md b/loader/README.md
index b88d98b..b3b9fdf 100644
--- a/loader/README.md
+++ b/loader/README.md
@@ -50,8 +50,8 @@
   #include "xglIcd.h"
 
   struct {
-        XGL_LOADER_DATA *reservedForLoader; // Reserve space for pointer to loader's dispatch table
-        myObjectClass myObj;                // Your driver's C++ class
+        XGL_LOADER_DATA reservedForLoader; // Reserve space for pointer to loader's dispatch table
+        myObjectClass myObj;               // Your driver's C++ class
   } xglObj;
 
   xglObj alloc_icd_obj()