Changing variable type for consistency

Signed-off-by: Emilio Cuesta <emiliocuesta@eprosima.com>

Author: emiliocuestaf

cpp_utils/include/cpp_utils/ReturnCode.hpp

@@ -88,9 +88,8 @@ class ReturnCode
     //! Link every ReturnCodeValue available with a string to deserialize
     static const std::map<ReturnCodeValue, std::string> to_string_conversion_;
 
-    //! \c ReturnCode value
-    std::uint32_t value_;
-
+    //! \c ReturnCodeValue
+    ReturnCodeValue value_;
 
     // operator << needs access to the object
     CPP_UTILS_DllAPI