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In case of error, the function clk_register() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: Xu Wang <vulab@iscas.ac.cn> Link: https://lore.kernel.org/r/20200921034522.9077-1-vulab@iscas.ac.cn Acked-by: Barry Song <baohua@kernel.org> Signed-off-by: Stephen Boyd <sboyd@kernel.org>