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If "buf[0]" is 255 then "len" gets set to 0. The call to "crc_ccitt(0xffff, buf, len - 2);" casts the "len - 2" to a high positive number which is ugly. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>