Sanity check the return from final_finish_mac
The return value is checked for 0. This is currently safe but we should really check for <= 0 since -1 is frequently used for error conditions. Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3 Solutions) for reporting this issue. Reviewed-by:Andy Polyakov <appro@openssl.org> (cherry picked from commit c427570e) Conflicts: ssl/ssl_locl.h Conflicts: ssl/ssl_locl.h
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