drm/amd/pm: fix memleak issue in smu_v15_0_8_get_gpu_metrics()
remove unsued code to avoid memleak issue.
(NOTE: This bug occurs during internal branch switching)
Fixes: 0a66ca3b351f ("drm/amd/pm: add get_gpu_metrics support for 15.0.8")
Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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