fix

Committed-by: xiaolei.zl from Dev container

Author: zhanglei1949

flex/engines/graph_db/database/wal/wal.h

@@ -92,8 +92,6 @@ class IWalParser {
 
   virtual void close() = 0;
 
-  virtual void close() = 0;
-
   virtual uint32_t last_ts() const = 0;
 
   /*