On Fri, 19 Mar 2021 07:44:41 +0800, kernel test robot wrote:

arch/powerpc/kernel/iommu.c:76:2-16: WARNING: NULL check before some freeing functions is not needed.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

[...]

Applied to powerpc/next.

[1/1] powerpc/iommu/debug: fix ifnullfree.cocci warnings
      https://git.kernel.org/powerpc/c/bbbe563f8490958861777d98871e16960163ea1b

cheers