Simplify the return expression.

Link: https://lore.kernel.org/r/20200921131054.92797-1-miaoqinglang@huawei.comSigned-off-by: NQinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: NRob Herring <robh@kernel.org>