fix codedex warning

mindspore/ccsrc/backend/optimizer/mem_reuse/mem_swap_manager.cc

@@ -450,13 +450,13 @@ size_t MemSwapManager::BestSwapInPerformPos(const AnfNodePtr &trigger_kernel, co
   return pos;
 }
 
-void MemSwapManager::MoveSwapInfoPos(size_t des_pos, size_t src_pos, const MemSwapInfo &mem_swap_info) {
-  if (des_pos == src_pos) {
+void MemSwapManager::MoveSwapInfoPos(size_t dest_pos, size_t src_pos, const MemSwapInfo &mem_swap_info) {
+  if (dest_pos == src_pos) {
     MS_LOG(EXCEPTION) << "destination pos can not equal source pos";
   }
-  auto des_kernel = QueryKernelByTopoOrder(des_pos);
+  auto dest_kernel = QueryKernelByTopoOrder(dest_pos);
   auto src_kernel = QueryKernelByTopoOrder(src_pos);
-  AddKernelMemSwapInfo(des_kernel, mem_swap_info);
+  AddKernelMemSwapInfo(dest_kernel, mem_swap_info);
   RemoveKernelMemSwapInfo(src_kernel, mem_swap_info);
 }