media: dvb-frontends: drop check because i2c_unregister_device() is NULL safe

No need to check the argument of i2c_unregister_device() because the
function itself does it.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/dvb-frontends/m88ds3103.c

@@ -1920,8 +1920,7 @@ static void m88ds3103_remove(struct i2c_client *client)
 
 	dev_dbg(&client->dev, "\n");
 
-	if (dev->dt_client)
-		i2c_unregister_device(dev->dt_client);
+	i2c_unregister_device(dev->dt_client);
 
 	i2c_mux_del_adapters(dev->muxc);