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Skip gamma correction of cursor data if premultiplied R/G/B > alpha

Michel Dänzer requested to merge daenzer/xf86-video-amdgpu:cursor-unpremultiply-overflow-no-gamma into master

The un-premultiplied R/G/B values would overflow the gamma LUT, so just pass through the data unchanged, and leave it up to the HW how to interpret such weird premultiplied alpha pixels.

Bugzilla: https://bugs.freedesktop.org/108355

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