Inside amdgpu_gtt_mgr_fini add a missing lock to maintain
locking balance
Signed-off-by: NMikita Lipski <mikita.lipski@amd.com>
Reviewed-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>