Fontmaps can be 256 or 512 in length. The only driver that can do tileblitting
can only handle 256 characters.  Check for this when setting the font.
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>