[radeon-alex:drm-next-4.20-wip 220/310] drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c:771:1-3: WARNING: PTR_ERR_OR_ZERO can be used

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tree:   git://people.freedesktop.org/~agd5f/linux.git drm-next-4.20-wip
head:   d8de8260a45aae8f74af77eae9a162bdc0ed48d2
commit: e498eb7136042aa9a352b1039c678537f4694158 [220/310] drm/amd/display: Add support for hw_state logging via debugfs


coccinelle warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c:771:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
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