We already unlocked a few lines earlier so this code unlocks twice on
the success path.

Fixes: 289921b0 ("drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)")
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Reviewed-by: NKevin Wang <kevin1.wang@amd.com>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>