[buddy] Addref in fdd_intaddvarblock

* src/fdd.c (fdd_intaddvarblock): Add missing addref.

Signed-off-by: Jaco van de Pol <J.C.vandepol@ewi.utwente.nl>
Signed-off-by: Michael Weber <michaelw@cs.utwente.nl>

buddy/src/fdd.c

@@ -954,6 +954,8 @@ int fdd_intaddvarblock(int first, int last, int fixed)
       res = tmp;
    }
 
+   bdd_addref(res); // Added by Jaco van de Pol, 25 march 2010
+
    err = bdd_addvarblock(res, fixed);
 
    bdd_delref(res);