* fix compile error. i should know better

This commit was SVN r7534.

opal/memory/memory.c

@@ -194,7 +194,7 @@ opal_mem_free_register_handler(opal_mem_free_unpin_fn_t *func, void *cbdata)
     opal_list_append(&callback_list, (opal_list_item_t*) new_cbitem);
 
  done:
-    if (OMPI_EXISTS == rc && NULL != new_cbitem) {
+    if (OMPI_EXISTS == ret && NULL != new_cbitem) {
         OBJ_RELEASE(new_cbitem);
     }