Correctly compute the size of the new datatype description. Before, the size was always

larger than required, now we are a lot more conservative.

This commit was SVN r10201.

ompi/datatype/dt_create_struct.c

@@ -36,10 +36,6 @@ int32_t ompi_ddt_create_struct( int count, const int* pBlockLength, const long*
     /* if we compute the total number of elements before we can
      * avoid increasing the size of the desc array often.
      */
-    for( i = 0; i < count; i++ ) {
-        disp += pTypes[i]->desc.used;
-        if( pBlockLength[i] != 1 ) disp += 2;
-    }
     lastType = (ompi_datatype_t*)pTypes[0];
     lastBlock = pBlockLength[0];
     lastExtent = lastType->ub - lastType->lb;