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In case of error, the function of_iomap() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. And the function devm_regmap_init_mmio() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com> Acked-by: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com>