drm/amd/amdgpu/amdgpucs: fix refcount leak of a dmafence obj
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.189 by commit 4009f104b02b223d1a11d74b36b1cc083bc37028. For more details please see the references link.