Remove some unused variables

libs/ardour/ardour/graph.h

@@ -137,14 +137,12 @@ private:
 	pframes_t   _process_nframes;
 	samplepos_t _process_start_sample;
 	samplepos_t _process_end_sample;
-	bool        _process_can_record;
 	bool        _process_non_rt_pending;
 
 	enum ProcessMode {
 		Roll, NoRoll, Silence
 	} _process_mode;
 
-	bool _process_noroll;
 	int  _process_retval;
 	bool _process_need_butler;
 

libs/ardour/io.cc

@@ -535,7 +535,6 @@ XMLNode&
 IO::state () const
 {
 	XMLNode* node = new XMLNode (state_node_name);
-	int n;
 	Glib::Threads::RWLock::WriterLock wl (_io_lock);
 
 	node->set_property ("name", name());