V4L/DVB (13805): Fix: Unregister the frontend before detaching

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/mantis/mantis_dvb.c

@@ -281,8 +281,8 @@ int __devexit mantis_dvb_exit(struct mantis_pci *mantis)
 		err = mantis_frontend_shutdown(mantis);
 		if (err != 0)
 			dprintk(MANTIS_ERROR, 1, "Frontend exit while POWER ON! <%d>", err);
-		dvb_frontend_detach(mantis->fe);
 		dvb_unregister_frontend(mantis->fe);
+		dvb_frontend_detach(mantis->fe);
 	}
 
 	tasklet_kill(&mantis->tasklet);