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coLunacyDNS: Fix bug where we improperly use FD_ISSET w.r.t. select()
If you use FD_ISSET on a connection never set with FD_SET, this triggers a buffer overflow in Ubuntu’s 20.04 glibc. Fixed. Found when updating tests for https://github.com/samboy/MaraDNS/issues/91 This *also* means we will need to make a coLunacyDNS 1.0.010
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