clk: fix error check for devm_clk_get_optional()
If skip all return error number, it may skip some real error cases, so only skip the error when the clock is not provided in DTS 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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