Mario Kleiner 7bc86c7d23 modesetting: Adapt xf86HandleColorMaps() for > 24 color depth. (v2)
This retains old behavior for depths <= 24, but allows gamma
table and colormap updates to work properly at depth 30.

This needs the xf86Randr12CrtcComputeGamma() fix for depth 30
from a previous commit to work. Otherwise the server will work,
but gamma table updates will silently fail, iow. the server
would always run with a default identity gamma lut.

v2: Simplify as proposed by Michel.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Antoine Martin <antoine@nagafix.co.uk> (v1)
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					X Server

The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.

Windows are then composed on the actual screen by the X server
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