dnssec_rsa_verify_raw() asserts that RSA_size(key) matches the RRSIG signature size, and dnssec_ecdsa_verify_raw() asserts that EC_KEY_check_key() succeeds. Both conditions depend on parsed DNS record content. Replace with proper error returns. The actual crypto verify calls (EVP_PKEY_verify / ECDSA_do_verify) handle mismatches fine on their own, so the asserts were also redundant. While at it, fix the misleading "EC_POINT_bn2point failed" log message that actually refers to an EC_KEY_set_public_key() failure. Fixes: https://github.com/systemd/systemd/issues/41569
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