[media] mn88473: Remove uneeded check 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/staging/media/mn88473/mn88473.c

@@ -262,8 +262,7 @@ static int mn88473_init(struct dvb_frontend *fe)
 
 	return 0;
 err:
-	if (fw)
-		release_firmware(fw);
+	release_firmware(fw);
 
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;