Missed one cdecl

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10126 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/languages/mod_managed/managed/ManagedSession.cs

@@ -61,7 +61,7 @@ namespace FreeSWITCH.Native
             InitManagedSession(ManagedSession.getCPtr(this).Handle, inputCallback, hangupCallback);
         }
         DtmfCallback _inputCallbackRef;
-        Action _hangupCallback;
+        CdeclAction _hangupCallback;
 
         /// <summary>Function to execute when this session hangs up.</summary>
         public Action HangupFunction { get; set; }