periodic msg source: remove n_sent function

include/foo/periodic_msg_source.h

@@ -39,7 +39,6 @@ public:
 	virtual void start_tx() = 0;
 	virtual void stop_tx() = 0;
 	virtual bool is_running() = 0;
-	virtual uint32_t n_sent() = 0;
 };
 
 }  // namespace foo

lib/periodic_msg_source_impl.cc

@@ -160,12 +160,6 @@ periodic_msg_source_impl::is_running() {
 	return !d_finished;
 }
 
-uint32_t
-periodic_msg_source_impl::n_sent() {
-	gr::thread::scoped_lock(d_mutex);
-	return d_nmsg_total - d_nmsg_left;
-}
-
 periodic_msg_source::sptr
 periodic_msg_source::make(pmt::pmt_t msg, float interval, int num_msg, bool debug) {
 	return gnuradio::get_initial_sptr(new periodic_msg_source_impl(msg, interval, num_msg, debug));

lib/periodic_msg_source_impl.h

@@ -50,7 +50,6 @@ namespace foo {
 			void start_tx();
 			void stop_tx();
 			bool is_running();
-			uint32_t n_sent();
 
 	};