op_commutative.c: don't check if the op is predefined or not

MPI_OP_COMMUTATIVE should work on all MPI_Op's -- regardless of
whether they are predefined or not.

Refs trac:4548.

This commit was SVN r31491.

The following Trac tickets were found above:
  Ticket 4548 --> https://svn.open-mpi.org/trac/ompi/ticket/4548

ompi/mpi/c/op_commutative.c

@@ -9,7 +9,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2009      Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2009-2014 Cisco Systems, Inc.  All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -45,8 +45,7 @@ int MPI_Op_commutative(MPI_Op op, int *commute)
 
     if (MPI_PARAM_CHECK) {
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
-        if (NULL == op ||
-            !ompi_op_is_intrinsic(op)) {
+        if (NULL == op) {
             return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OP,
                                           FUNC_NAME);
         }