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[Why & How] Add three KUnit tests covering the early-exit validation guard in amdgpu_dm_psr_set_event(): - NULL stream argument returns false immediately - Valid stream with NULL link returns false - Valid stream/link with psr_feature_enabled == false returns false Assisted-by: Copilot:Claude-Sonnet-4.6 Reviewed-by: Ray Wu <ray.wu@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Ray Wu <ray.wu@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>