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Fix warning #490

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Fix warning #490

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flu0r1ne
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@flu0r1ne flu0r1ne commented Oct 4, 2023

This fixes an "unused variable" warning printed during compilation on 13.2.1.

Tested on Linux and FreeBSD wtih:

make clean
make
MTR_PACKET="./mtr-packet" sudo -E ./mtr -t --udp 2606:4700:4700::1111

@flu0r1ne
Fix unused variable warning
0b34810 
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.
@flu0r1ne
udp4_checksum -> udp_checksum (also used for ipv6)
94362ed 
`udp4_checksum` is also used to checksum udp over ipv6.
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