clk: davinci: cfgchip: use PTR_ERR_OR_ZERO in da8xx_cfgchip_register_div4p5
use PTR_ERR_OR_ZERO inetead of return code Signed-off-by:Ding Xiang <dingxiang@cmss.chinamobile.com> Signed-off-by:
Stephen Boyd <sboyd@kernel.org>
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