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To tell the programmer how to handle the data on the spi bus, a flag in
the fourth byte sent with the usb command is used. The second word was
mistaken for the size of the chunks sent over usb earlier. The third
byte (first of the second word) is now set to zero. This also adds some
checks for the size of data chunks sent over usb.

Corresponding to flashrom svn r1546.
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>