V4L/DVB (7805): saa7134: dvb_unregister_frontend() shouldn't be called, if not registered yet

Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/saa7134/saa7134-dvb.c

@@ -1339,7 +1339,6 @@ static int dvb_init(struct saa7134_dev *dev)
 
 dettach_frontend:
 	dvb_frontend_detach(dev->dvb.frontend);
-	dvb_unregister_frontend(dev->dvb.frontend);
 	dev->dvb.frontend = NULL;
 
 	return -1;