spi_mpc83xx: reject invalid transfer sizes
Error out on transfer length != multiple of bytes per word with -EINVAL. Fixes a buffer overrun crash if length < bytes per word. Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk> Acked-by: NJoakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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