Alessandro Rubini authored Mar 19, 2017 and Adam Wujek committed Jun 22, 2017

This is my own fault introduced here:

   765443c7

 udp: bugfix for checksum generation

It made no harm, because all send frames were oversized, but I'm now
using fixed-size buffers, and this overwrites the own IP address
thus corrupting the checksum and so on.

Pity me.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>