Revert "udp: remove redundant variable"
This reverts commit 81d54ec8 . If we take the "try_again" goto, due to a checksum error, the 'len' has already been truncated. So we won't compute the same values as the original code did. Reported-by: paul bilke <fsmail@conspiracy.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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b03b6dd5
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