if data is contiguous need_buffers should return 0, not 1

This commit was SVN r9009.

ompi/datatype/convertor.h

@@ -161,7 +161,7 @@ ompi_convertor_personalize( ompi_convertor_t* pConv, uint32_t flags,
 static inline int32_t
 ompi_convertor_need_buffers( const ompi_convertor_t* pConvertor )
 {
-    return ompi_ddt_is_contiguous_memory_layout( pConvertor->pDesc, pConvertor->count );
+    return !ompi_ddt_is_contiguous_memory_layout( pConvertor->pDesc, pConvertor->count );
 }
 
 /*