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[Why] When forced modes are used during certain IGT tests, without a real connector, dc_sink would be null when standard modes are added by the driver. Calling the function to update freesync capabilities at this point will result in an error being printed [How] Use emulated sink when available. If both the normal and emulated sink are not available, set all freesync parameters to 0. Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Tested-by: Daniel Wheeler <Daniel.Wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>