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screensaver: trap X11 errors on gamma change

Jeffrey Knockel requested to merge jeffk/gnome-flashback:fix-fade-crash into master

Some X servers (e.g., xorgrdp) appear to always generate BadValue on XF86VidModeSetGamma(), even if the corresponding extension is supported and reported to be of a sufficiently high version. This patch traps these BadValue errors, preventing Xlib from killing the program upon their receipt.

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