udp.c: Add a comment about the salen cast
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Sat, 21 Sep 2019 10:05:21 +0000 (11:05 +0100)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Sat, 21 Sep 2019 10:06:48 +0000 (11:06 +0100)
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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