drm/amdgpu: cleanup amdgpu_cs_list_validate

	struct amdgpu_fpriv *fpriv = p->filp->driver_priv;

	struct amdgpu_vm *vm = &fpriv->vm;

	struct amdgpu_bo_list_entry *lobj;

	struct amdgpu_bo *bo;

	u64 initial_bytes_moved;

	int r;

	list_for_each_entry(lobj, validated, tv.head) {

		bo = lobj->robj;

		if (!bo->pin_count) {

			u32 domain = lobj->prefered_domains;

			u32 current_domain =

				amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);

			/* Check if this buffer will be moved and don't move it

			 * if we have moved too many buffers for this IB already.

		struct amdgpu_bo *bo = lobj->robj;

		uint32_t domain;

		lobj->bo_va = amdgpu_vm_bo_find(vm, bo);

		if (bo->pin_count)

			continue;

		/* Avoid moving this one if we have moved too many buffers

		 * for this IB already.

		 *

		 * Note that this allows moving at least one buffer of

		 * any size, because it doesn't take the current "bo"

		 * into account. We don't want to disallow buffer moves

		 * completely.

		 */

			if ((lobj->allowed_domains & current_domain) != 0 &&

			    (domain & current_domain) == 0 && /* will be moved */

			    p->bytes_moved > p->bytes_moved_threshold) {

				/* don't move it */

				domain = current_domain;

			}

		if (p->bytes_moved <= p->bytes_moved_threshold)

			domain = lobj->prefered_domains;

		else

			domain = lobj->allowed_domains;

	retry:

		amdgpu_ttm_placement_from_domain(bo, domain);

			return r;

		}

	}

		lobj->bo_va = amdgpu_vm_bo_find(vm, bo);

	}

	return 0;

}