Correctly use the ompi_ddt_type_size function.

This commit was SVN r2931.

src/datatype/dt_pack.c

@@ -841,10 +841,12 @@ ompi_convertor_t* ompi_convertor_get_copy( ompi_convertor_t* pConvertor )
 /* Actually we suppose that we can only do receiver side conversion */
 int ompi_convertor_get_packed_size( ompi_convertor_t* pConv, unsigned int* pSize )
 {
-   if( ompi_ddt_type_size( pConv->pDesc, pSize ) != 0 )
+   int ddt_size = 0;
+
+   if( ompi_ddt_type_size( pConv->pDesc, &ddt_size ) != 0 )
       return OMPI_ERROR;
    /* actually *pSize contain the size of one instance of the data */
-   *pSize = (*pSize) * pConv->count;
+   *pSize = ddt_size * pConv->count;
    return OMPI_SUCCESS;
 }