drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities

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SUSE CVE-2025-39707

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: check if hubbub is NULL in debugfs/amdgpudmcapabilities HUBBUB structure is not initialized on DCE hardware, so check if it is NULL to avoid null dereference while accessing amdgpudmcapabilities file in debugfs...

CVE-2025-39707

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: check if hubbub is NULL in debugfs/amdgpudmcapabilities HUBBUB structure is not initialized on DCE hardware, so check if it is NULL to avoid null dereference while accessing amdgpudmcapabilities file in debugfs...