Fix warning #490
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Fix warning #490
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Commit d6171b8 switched from using the kernel's `IPV6_CHECKSUM` to calculate the checksum to a manual checksum calculation. Although, it did not remove the reference to the socket leading to an unused variable warning.
`udp4_checksum` is also used to checksum udp over ipv6.
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This fixes an "unused variable" warning printed during compilation on 13.2.1.
Tested on Linux and FreeBSD wtih: