drm: bridge: dw-hdmi: Remove redundant null check before clk_disable_unprepare
Because clk_disable_unprepare() already checked NULL clock parameter, so the additional check is unnecessary, just remove them. Signed-off-by: Xu Wang <vulab@iscas.ac.cn> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
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