Remove commented code.

src/libespeak-ng/fifo.c

 		my_command_is_running = 1;
 
 		assert(-1 != pthread_cond_broadcast(&my_cond_command_is_running));
-		//assert(-1 != pthread_mutex_unlock(&my_mutex));
 
 		while (my_command_is_running) {
-			//int a_status = pthread_mutex_lock(&my_mutex);
-			//assert(!a_status);
 			t_espeak_command *a_command = (t_espeak_command *)pop();
 
 			if (a_command == NULL) {