mfd: htc-i2cpld: 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 <wsa+renesas@sang-engineering.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/htc-i2cpld.c

@@ -385,8 +385,7 @@ static void htcpld_unregister_chip_i2c(
 	htcpld = platform_get_drvdata(pdev);
 	chip = &htcpld->chip[chip_index];
 
-	if (chip->client)
-		i2c_unregister_device(chip->client);
+	i2c_unregister_device(chip->client);
 }
 
 static int htcpld_register_chip_gpio(