[media] i2c: Deletion of an unnecessary check before the function call "rc_unregister_device"

The rc_unregister_device() 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/i2c/ir-kbd-i2c.c

···
 	cancel_delayed_work_sync(&ir->work);
 
 	/* unregister device */
-	if (ir->rc)
-		rc_unregister_device(ir->rc);
+	rc_unregister_device(ir->rc);
 
 	/* free memory */
 	return 0;