Fix TFTP OACK code for short packets.
The old code had a loop limit overflow bug which caused a semi- infinite loop for small packets, because in "i<len-8", "i" was signed, but "len" was unsigned, and "len-8" became a huge number for small values of "len". This is a workaround which replaces broken commit 8f1bc284. Signed-off-by: NWolfgang Denk <wd@denx.de>
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