tgafb: fix cmap memory leak
Fix cmap leak when register_framebuffer fails. Signed-off-by: NAndres Salomon <dilinger@debian.org> Acked-by: NKrzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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