ptz: Remove unnecessary member variable

src/libvisca-thread.cpp

@@ -23,6 +23,7 @@ libvisca_thread::libvisca_thread()
 	zoom_got = 0;
 	pthread_mutex_init(&mutex, 0);
 
+	pthread_t thread;
 	pthread_create(&thread, NULL, libvisca_thread::thread_main, (void*)this);
 	pthread_detach(thread);
 }

src/libvisca-thread.hpp

@@ -7,7 +7,6 @@
 class libvisca_thread : public ptz_backend
 {
 	pthread_mutex_t mutex;
-	pthread_t thread;
 	struct _VISCA_interface *iface;
 	struct _VISCA_camera *camera;
 	struct obs_data *data;