dnsdist: Add the TCP socket to the map only if the connection succeeds #4734
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Otherwise we create a value-initialized (to 0) entry in the map and try to use it later.
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Short description
Otherwise we create a value-initialized (to 0) entry in the map and try to use it later, as reported by @philmayers and tracked down by @ahupowerdns in #4733.
Fixes #4733.
Checklist
I have: