drm/amd/display: Guard against invalid array access
[Why] There are scenarios where no OPP is assigned to an OTG so its value is 0xF which is outside the size of the OPP array causing a potential driver crash. [How] Change the assert to an early return to guard against access. If there's no OPP assigned already, then OTG will be blank anyways so no functionality should be lost. Signed-off-by: NAric Cyr <aric.cyr@amd.com> Reviewed-by: NZhan Liu <Zhan.Liu@amd.com> Acked-by: NQingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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