CVE-2024-46896 drm/amdgpu: don't access invalid sched

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: don't access invalid sched Since 2320c9e6a768 "drm/sched: memset 'job' in drmschedjobinit" accessing job-base.sched can produce unexpected results as the initialisation of job-base.sched done in amdgpujoballoc is...