clk: mediatek: mt6797: simplify the return expression of mtk_infrasys_init

Simplify the return expression.

Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20200921082425.2590990-1-liushixin2@huawei.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>