glx: fix memory corruption with r5g6b5
should cherry-pick to xserver-1.5
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			@ -420,10 +420,13 @@ findFirstSet(unsigned int v)
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static void
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initGlxVisual(VisualPtr visual, __GLXconfig *config)
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{
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    int maxBits;
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    maxBits = max(config->redBits, max(config->greenBits, config->blueBits));
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    config->visualID = visual->vid;
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    visual->class = glxConvertToXVisualType(config->visualType);
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    visual->bitsPerRGBValue = config->redBits;
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    visual->ColormapEntries = 1 << config->redBits;
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    visual->bitsPerRGBValue = maxBits;
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    visual->ColormapEntries = 1 << maxBits;
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    visual->nplanes = config->redBits + config->greenBits + config->blueBits;
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    visual->redMask = config->redMask;
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