[media] as102: 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 <Julia.Lawall@lip6.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/as102/as102_drv.c

@@ -337,6 +337,7 @@ int as102_dvb_register(struct as102_dev_t *as102_dev)
 				       &as102_dev->bus_adap,
 				       as102_dev->elna_cfg);
 	if (!as102_dev->dvb_fe) {
+		ret = -ENODEV;
 		dev_err(dev, "%s: as102_attach() failed: %d",
 		    __func__, ret);
 		goto efereg;