coverity CID 1472866: missing return in mca_base_var_load_extra_files

Signed-off-by: Aurelien Bouteiller <bouteill@icl.utk.edu>

Author: abouteiller

opal/mca/base/mca_base_var.c

@@ -3,7 +3,7 @@
  * Copyright (c) 2004-2008 The Trustees of Indiana University and Indiana
  *                         University Research and Technology
  *                         Corporation.  All rights reserved.
- * Copyright (c) 2004-2012 The University of Tennessee and The University
+ * Copyright (c) 2004-2021 The University of Tennessee and The University
  *                         of Tennessee Research Foundation.  All rights
  *                         reserved.
  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,