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drm/amdgpu: fail if no buffer object handle chunk provided

Demi Marie Obenour requested to merge DemiMarie/virglrenderer:amd-no-null-ptr-deref into main

If an AMDGPU_CCMD_CS_SUBMIT request has a nonzero bo_count but no AMDGPU_CHUNK_ID_BO_HANDLES chunk, the code that prints an error if the submit ioctl failed would suffer a null pointer dereference.

Signed-off-by: Demi Marie Obenour demi@invisiblethingslab.com

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