fbdev: Fix palette handling in various drivers

The bug described here:

http://lkml.org/lkml/2007/5/27/104

resulting from improper palette handling in neofb prompted me to audit the palette handling in various drivers. Most of the problems are over-allocating memory for the palette (not really a problem, just wastes memory) but a few have bugs similar to the one described above.

Andrew,

(Since I can only compile test some of them, you can keep them in -mm for a while).

Tony

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