[media] Fix regression in some dib0700 based devices

Fix regression in some dib0700 based devices.
Set size_of_priv, and don't call dvb_detach unnecessarily.
This resolves the oops(s) for my "Leadtek Winfast DTV Dongle (STK7700P based)"
Signed-off-by: James Harper <james.harper@ejbdigital.com.au>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/dvb-usb/dib0700_devices.c

@@ -723,7 +723,6 @@ static int stk7700p_frontend_attach(struct dvb_usb_adapter *adap)
 		adap->fe_adap[0].fe = state->dib7000p_ops.init(&adap->dev->i2c_adap, 18, &stk7700p_dib7000p_config);
 		st->is_dib7000pc = 1;
 	} else {
-		dvb_detach(&state->dib7000p_ops);
 		memset(&state->dib7000p_ops, 0, sizeof(state->dib7000p_ops));
 		adap->fe_adap[0].fe = dvb_attach(dib7000m_attach, &adap->dev->i2c_adap, 18, &stk7700p_dib7000m_config);
 	}
@@ -3804,6 +3803,7 @@ struct dvb_usb_device_properties dib0700_devices[] = {
 
 				DIB0700_DEFAULT_STREAMING_CONFIG(0x02),
 			}},
+				.size_of_priv     = sizeof(struct dib0700_adapter_state),
 			},
 		},