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Silence a scan-build warning in dns_rbt_addname()

Michał Kępień requested to merge michal/silence-a-scan-build-warning-in-dns_rbt_addname into main

Clang Static Analyzer is unable to grasp that when dns_rbt_addnode() returns ISC_R_EXISTS, it always sets the pointer passed to it via its 'nodep' parameter to a non-NULL value. Add an extra safety check in the conditional expression used in dns_rbt_addname() to silence that warning.

See https://gitlab.isc.org/isc-private/bind9/-/merge_requests/605#note_423321

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