[media] radio: fix error return code

Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
{ ... return ret; }
|
ret = 0
)
... when != ret = e1
when != &ret
*if(...)
{
... when != ret = e2
when forall
return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/radio/radio-timb.c

···
 		i2c_get_adapter(pdata->i2c_adapter), pdata->tuner, NULL);
 	tr->sd_dsp = v4l2_i2c_new_subdev_board(&tr->v4l2_dev,
 		i2c_get_adapter(pdata->i2c_adapter), pdata->dsp, NULL);
-	if (tr->sd_tuner == NULL || tr->sd_dsp == NULL)
+	if (tr->sd_tuner == NULL || tr->sd_dsp == NULL) {
+		err = -ENODEV;
 		goto err_video_req;
+	}
 
 	tr->v4l2_dev.ctrl_handler = tr->sd_dsp->ctrl_handler;