Improve pidfd lifetime handling #1680
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Peeking into the list and then calling dup ourselves missed that we should have marked the file description as FD_CLOEXEC. By using the proper API to get the fd, this is done for us.
This removes a dup which can fail and was also missing a call to mark it as FD_CLOEXEC. Instead, the XdpAppInfo subclass which manages to construct, steals the pidfd.
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