[media] media: em28xx - add error handling for KWORLD dvb_attach failures

Add error hanlding when EM2870_BOARD_KWORLD_A340 dvb_attach()
for fe and tuner fail in em28xx_dvb_init().
Signed-off-by: NShuah Khan <shuah.kh@samsung.com>
Reviewed-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/em28xx/em28xx-dvb.c

@@ -1213,9 +1213,17 @@ static int em28xx_dvb_init(struct em28xx *dev)
 		dvb->fe[0] = dvb_attach(lgdt3305_attach,
 					   &em2870_lgdt3304_dev,
 					   &dev->i2c_adap[dev->def_i2c_bus]);
-		if (dvb->fe[0] != NULL)
-			dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
-				   &dev->i2c_adap[dev->def_i2c_bus], &kworld_a340_config);
+		if (!dvb->fe[0]) {
+			result = -EINVAL;
+			goto out_free;
+		}
+		if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
+			&dev->i2c_adap[dev->def_i2c_bus],
+			&kworld_a340_config)) {
+				dvb_frontend_detach(dvb->fe[0]);
+				result = -EINVAL;
+				goto out_free;
+		}
 		break;
 	case EM28174_BOARD_PCTV_290E:
 		/* set default GPIO0 for LNA, used if GPIOLIB is undefined */