[media] tuners: remove uneeded checks before release_firmware()

The release_firmware() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/tuners/si2157.c

@@ -196,7 +196,6 @@ static int si2157_init(struct dvb_frontend *fe)
 	return 0;
 
 err:
-	if (fw)
 	release_firmware(fw);
 
 	dev_dbg(&s->client->dev, "failed=%d\n", ret);

drivers/media/tuners/xc5000.c

@@ -1336,7 +1336,6 @@ static int xc5000_release(struct dvb_frontend *fe)
 
 	if (priv) {
 		cancel_delayed_work(&priv->timer_sleep);
-		if (priv->firmware)
 		release_firmware(priv->firmware);
 		hybrid_tuner_release_state(priv);
 	}