igt@i915_selftest@mock@buddy - incomplete

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8034/shard-skl5/igt@i915_selftest@mock@buddy.html#dmesg-warnings2665

<4> [451.054311]  ? debug_check_no_obj_freed+0x11d/0x210
<4> [451.054979]  ? __i915_buddy_free+0x77/0xd0 [i915]
<4> [451.055117]  ? kmem_cache_free+0x254/0x3d0
<4> [451.055704]  ? __i915_buddy_free+0x77/0xd0 [i915]
<4> [451.055825]  ? kmem_cache_free+0x254/0x3d0
<4> [451.056401]  ? __i915_buddy_free+0x77/0xd0 [i915]
<4> [451.056975]  ? i915_buddy_free_list+0x2e/0x60 [i915]
<4> [451.057626]  ? igt_buddy_alloc_smoke+0x14e/0x280 [i915]
<4> [451.058398]  ? __i915_subtests+0xb8/0x210 [i915]
<4> [451.059008]  ? i915_perf_selftests+0x60/0x60 [i915]
<4> [451.059825]  ? __i915_nop_setup+0x10/0x10 [i915]
<4> [451.060535]  ? __run_selftests+0x134/0x170 [i915]
<4> [451.060571]  ? 0xffffffffa064c000
<4> [451.061153]  ? i915_mock_selftests+0x27/0x50 [i915]
<4> [451.061725]  ? i915_init+0x12/0x7c [i915]