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[why] Check that the stream exists to add link->local_sink null pointer access protection. Reviewed-by: Harold Sun <harold.sun@amd.com> Reviewed-by: Ethan Cheung <ethan.cheung@amd.com> Signed-off-by: Charlene Liu <Charlene.Liu@amd.com> Signed-off-by: Ivan Lipski <ivan.lipski@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>