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[ Upstream commit490748874e] of_clk_get_by_name() returns error pointers instead of NULL. Use IS_ERR() checks the return value to catch errors. Fixes:836fb30949("soc: imx8m: Enable OCOTP clock before reading the register") Signed-off-by: Miaoqian Lin <linmq006@gmail.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>