[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 <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/tuners/si2157.c

···
 	return 0;
 
 err:
-	if (fw)
-		release_firmware(fw);
+	release_firmware(fw);
 
 	dev_dbg(&s->client->dev, "failed=%d\n", ret);
 	return ret;

drivers/media/tuners/xc5000.c

···
 
 	if (priv) {
 		cancel_delayed_work(&priv->timer_sleep);
-		if (priv->firmware)
-			release_firmware(priv->firmware);
+		release_firmware(priv->firmware);
 		hybrid_tuner_release_state(priv);
 	}