Fix magic number in fbdevhw
The transformation between fbdev and xfree86 mode timings needs to be invertible, otherwise Xen and other framebuffers that don't have real pixel clocks won't initialize.
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@ -258,7 +258,7 @@ fbdev_modes_equal(struct fb_var_screeninfo *set, struct fb_var_screeninfo *req)
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static void
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fbdev2xfree_timing(struct fb_var_screeninfo *var, DisplayModePtr mode)
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{
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mode->Clock = var->pixclock ? 1000000000/var->pixclock : 28000000;
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mode->Clock = var->pixclock ? 1000000000/var->pixclock : 0;
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mode->HDisplay = var->xres;
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mode->HSyncStart = mode->HDisplay+var->right_margin;
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mode->HSyncEnd = mode->HSyncStart+var->hsync_len;
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