Harmonize return values in dtls1_buffer_record
Harmonize return values in dtls1_buffer_record

Ensure all malloc failures return -1.

Reported by Adam Langley (Google).

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl