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[ Upstream commit10fce7ebe8] The devm_memremap() function returns error pointers on error, it doesn't return NULL. Fixes:c7cefce03e("hwmon: (xgene) access mailbox as RAM") Signed-off-by: Xinghuo Chen <xinghuo.chen@foxmail.com> Link: https://lore.kernel.org/r/tencent_9AD8E7683EC29CAC97496B44F3F865BA070A@qq.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Sasha Levin <sashal@kernel.org>