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[ Upstream commit2a65f7e277] In case of error, the function device_node_to_regmap() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Fixes:ca7b72b5a5("clocksource: Add driver for the Ingenic JZ47xx OST") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20210308123031.2285083-1-weiyongjun1@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>