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If memory is freed we need to nullify the pointer or the caller
might call kfree again (eg: amdgpu_cs_parser_fini calls kfree on
all non-null job pointers).
Fixes: db36632ea5 ("drm/amdgpu: clean up and unify hw fence handling")
Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>