Refs trac:496

Have no idea why this function always returns a failure.  It should
always return SUCCESS (provided the status is value).

This commit was SVN r12364.

The following Trac tickets were found above:
  Ticket 496 --> https://svn.open-mpi.org/trac/ompi/ticket/496

ompi/mpi/c/status_set_cancelled.c

@@ -38,6 +38,5 @@ int MPI_Status_set_cancelled(MPI_Status *status, int flag)
     }
 
     status->_cancelled = flag;
-
-    return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OTHER, FUNC_NAME);
+    return MPI_SUCCESS;
 }