optimise ssl3_get_cipher_by_std_name()

optimise ssl3_get_cipher_by_std_name()

Return immediately on matched cipher. Without this patch the code only breaks out of the inner for loop, meaning for a matched TLS13 cipher the code will still loop through 160ish SSL3 ciphers.

CLA: trivial

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(cherry picked from commit d93bded6aa2852e681de2ed76fb43c415687af68)

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/13280)