curl: Heap-buffer-overflow in `Curl_ssl_push_certinfo_len()` — sole bounds check is `DEBUGASSERT`

Summary Curlsslpushcertinfolen in lib/vtls/vtls.c uses DEBUGASSERTcertnum numofcerts as its only bounds check before writing a heap pointer into ci-certinfocertnum. DEBUGASSERT is a no-op in every release/production build lib/curlsetup.h:1084. Any mismatch between the count passed to...