i2c: keba: 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 <[e-mail]>
Signed-off-by: Andi Shyti <[e-mail]>

drivers/i2c/busses/i2c-keba.c

···
 {
 	int i;
 
-	for (i = 0; i < ki2c->client_size; i++) {
-		struct i2c_client *client = ki2c->client[i];
-
-		if (client)
-			i2c_unregister_device(client);
-	}
+	for (i = 0; i < ki2c->client_size; i++)
+		i2c_unregister_device(ki2c->client[i]);
 }
 
 static int ki2c_register_devices(struct ki2c *ki2c)