drm/amd/display: Fix color module crash when hotplug monitors.
Assume we have two monitors, and monitor 0 is unplugged. This shifts the internal state of index 1 to index 0 by memcpy. This means there are two copies of the gamma pointer previously owned by state[1]. When hotplug occurs, this re-assigns the new display with state[1], which has some garbage left over from before, including the gamma pointer. We should correctly clear unused states and re-initialize correctly. Also, due to async nature of the hotplug and other events like commit, we also need to safe guard against sink that has been removed. Signed-off-by: Anthony Koo <anthony.koo@amd.com> Reviewed-by: Aric Cyr <Aric.Cyr@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Harry Wentland <Harry.Wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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