Fix a memory access error and some leaks#2425
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```
SCARINESS: 12 (1-byte-read-heap-buffer-overflow)
#0 0x557f3a5b5100 in ndpi_get_host_domain /src/ndpi/src/lib/ndpi_domains.c:158:8
ntop#1 0x557f3a59b561 in ndpi_check_dga_name /src/ndpi/src/lib/ndpi_main.c:10412:17
ntop#2 0x557f3a51163a in process_chlo /src/ndpi/src/lib/protocols/quic.c:1467:7
ntop#3 0x557f3a469f4b in LLVMFuzzerTestOneInput /src/ndpi/fuzz/fuzz_quic_get_crypto_data.c:44:7
ntop#4 0x557f3a46abc8 in NaloFuzzerTestOneInput (/out/fuzz_quic_get_crypto_data+0x4cfbc8)
```
Some notes about the leak: if the insertion into the uthash fails (because of an
allocation failure), we need to free the just allocated entry. But the only
way to check if the `HASH_ADD_*` failed, is to perform a new lookup: a bit
costly, but we don't use that code in the fast-path.
See also efb261a
Credits for finding the issues to Philippe Antoine (@catenacyber) and its
`nallocfuzz` fuzzing engine
See: https://github.com/catenacyber/nallocfuzz
See: google/oss-fuzz#9902
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Some notes about the leak: if the insertion into the uthash fails (because of an allocation failure), we need to free the just allocated entry. But the only way to check if the
HASH_ADD_*failed, is to perform a new lookup: a bit costly, but we don't use that code in the fast-path. See also efb261aCredits for finding the issues to Philippe Antoine (@catenacyber) and its
nallocfuzzfuzzing engineSee: https://github.com/catenacyber/nallocfuzz
See: google/oss-fuzz#9902