[media] ec168: fix error return code

The rest of the function uses ret to store the return value, even setting
ret to i a few lines before this, so return ret instead of i.

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

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}

// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/dvb-usb-v2/ec168.c

@@ -170,7 +170,7 @@ static int ec168_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 
 error:
 	mutex_unlock(&d->i2c_mutex);
-	return i;
+	return ret;
 }
 
 static u32 ec168_i2c_func(struct i2c_adapter *adapter)