i2c: digicolor: use clk_disable_unprepare instead of clk_unprepare
since clk_prepare_enable() is used to get i2c->clk, we should use clk_disable_unprepare() to release it for the error path. Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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