twa_graph: remove the useless set_init_state(const state*)

* spot/twa/twagraph.hh: Here.
* NEWS: Mention the change.

NEWS

@@ -54,6 +54,10 @@ New in spot 2.3.1.dev (not yet released)
     explicit.  The implicit converion to bool (and, via bool, to int)
     was a source of bugs.
 
+  - spot::twa_graph::set_init_state(const state*) has been removed.
+    It was never used.  You always want to use
+    spot::twa_graph::set_init_state(unsigned) in practice.
+
 
 New in spot 2.3.1 (2017-02-20)
 

spot/twa/twagraph.hh

@@ -261,11 +261,6 @@ namespace spot
       init_number_ = s;
     }
 
-    void set_init_state(const state* s)
-    {
-      set_init_state(state_number(s));
-    }
-
     template<class I>
     void set_univ_init_state(I dst_begin, I dst_end)
     {