WARNING: kfree(NULL) is safe this check is probably not required

Hi Alex,

FYI, there are new warnings show up in

tree:   git://people.freedesktop.org/~agd5f/linux.git drm-next-3.12-wip
head:   21419df38d4ba010b1ea80e2f91b853c8c3de7e5
commit: 38306848032ac045ac5a5f3145271bc01176883e [31/90] drm/radeon/dpm: add support for parsing the atom powertune table

scripts/checkpatch.pl 0001-drm-radeon-dpm-add-support-for-parsing-the-atom-powe.patch

WARNING: kfree(NULL) is safe this check is probably not required #73: drivers/gpu/drm/radeon/r600_dpm.c:1079:
+ if (rdev->pm.dpm.dyn_state.cac_tdp_table)
+ kfree(rdev->pm.dpm.dyn_state.cac_tdp_table);

The warning also shows up in many of the follow up patches.

[radeon-alex:drm-next-3.12-wip 32/90] WARNING: kfree(NULL) is safe [radeon-alex:drm-next-3.12-wip 35/90] WARNING: kfree(NULL) is safe [radeon-alex:drm-next-3.12-wip 36/90] WARNING: kfree(NULL) is safe [radeon-alex:drm-next-3.12-wip 38/90] WARNING: kfree(NULL) is safe [radeon-alex:drm-next-3.12-wip 39/90] WARNING: kfree(NULL) is safe

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