msg/Message.h: add const to member function

Signed-off-by: Michal Jarzabek <stiopa@gmail.com>

diff --git a/src/msg/Message.h b/src/msg/Message.h
index 30270417d114de0892816efe8d889eb2ca61d381..4d93975804b9bad3743183e0f6418dd009094898 100644 (file)
--- a/src/msg/Message.h
+++ b/src/msg/Message.h
@@ -388,7 +388,7 @@ public:
       byte_throttler->put(data.length());
     bl.claim(data, flags);
   }
-  off_t get_data_len() { return data.length(); }
+  off_t get_data_len() const { return data.length(); }
 
   void set_recv_stamp(utime_t t) { recv_stamp = t; }
   const utime_t& get_recv_stamp() const { return recv_stamp; }