Fix ssl_get_prev_session overrun
If OpenSSL is configured with no-tlsext then ssl_get_prev_session can read past the end of the ClientHello message if the session_id length in the ClientHello is invalid. This should not cause any security issues since the underlying buffer is 16k in size. It should never be possible to overrun by that many bytes. This is probably made redundant by the previous commit - but you can never be too careful. With thanks to Qinghao Tang for reporting this issue. Reviewed-by:Rich Salz <rsalz@openssl.org> (cherry picked from commit 5e0a80c1)
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