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The devm_memremap() function returns error pointers on error, it doesn't return NULL. Fixes: 19d54020883c ("firmware: google: Implement cbmem in sysfs driver") Signed-off-by: Peng Wu <wupeng58@huawei.com> Reviewed-by: Guenter Roeck <groeck@chromium.org> Reviewed-by: Jack Rosenthal <jrosenth@chromium.org> Link: https://lore.kernel.org/r/20221115091138.51614-1-wupeng58@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>