The devm_ioremap_resource() function returns error pointers on error, it never returns NULL. Update the check accordingly. Fixes: 9eef7f9da928 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>