Add processing of the key_share received in the ServerHello

Reviewed-by: Rich Salz <rsalz@openssl.org>

ssl/ssl_err.c

diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c
index 7523f1c..fcd4375 100644
--- a/ssl/ssl_err.c
+++ b/ssl/ssl_err.c
@@ -342,6 +342,7 @@
     {ERR_REASON(SSL_R_BAD_ECPOINT), "bad ecpoint"},
     {ERR_REASON(SSL_R_BAD_HANDSHAKE_LENGTH), "bad handshake length"},
     {ERR_REASON(SSL_R_BAD_HELLO_REQUEST), "bad hello request"},
+    {ERR_REASON(SSL_R_BAD_KEY_SHARE), "bad key share"},
     {ERR_REASON(SSL_R_BAD_LENGTH), "bad length"},
     {ERR_REASON(SSL_R_BAD_PACKET_LENGTH), "bad packet length"},
     {ERR_REASON(SSL_R_BAD_PROTOCOL_VERSION_NUMBER),