clk: check valid clock by clk_valid()
Add valid check for clk->dev, it's useful when get optional clock even when the clk point is valid, but its dev will be NULL. Signed-off-by: NChunfeng Yun <chunfeng.yun@mediatek.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NRyder Lee <ryder.lee@mediatek.com>
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