media: dvb-frontends/af9033.c: fix missing error codes

Fixes two smatch warnings:

drivers/media/dvb-frontends/af9033.c:128 af9033_init() warn: missing error code 'ret'
drivers/media/dvb-frontends/af9033.c:855 af9033_read_snr() warn: missing error code 'ret'

Set error codes correctly.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/dvb-frontends/af9033.c

@@ -125,6 +125,7 @@ static int af9033_init(struct dvb_frontend *fe)
 	if (i == ARRAY_SIZE(clock_adc_lut)) {
 		dev_err(&client->dev, "Couldn't find ADC config for clock %d\n",
 			dev->cfg.clock);
+		ret = -ENODEV;
 		goto err;
 	}
 
@@ -852,6 +853,7 @@ static int af9033_read_snr(struct dvb_frontend *fe, u16 *snr)
 				*snr = *snr * 0xffff / 32;
 				break;
 			default:
+				ret = -EINVAL;
 				goto err;
 			}
 		}