Add missing break statement in ssl3_get_client_hello.

dc9b141127 added a default case when importing
the patch but accidentally falls through all the time.

Change-Id: Ieb9beeb9e3ffcf77f2842841eda7d28a62fe8072
Reviewed-on: https://boringssl-review.googlesource.com/1073
Reviewed-by: Adam Langley <agl@google.com>

ssl/s3_srvr.c

@@ -966,7 +966,9 @@ int ssl3_get_client_hello(SSL *s)
 				}
 			}
 		s->state = SSL3_ST_SR_CLNT_HELLO_D;
+		break;
 	default:
+		OPENSSL_PUT_ERROR(SSL, ssl3_get_client_hello, SSL_R_UNKNOWN_STATE);
 		return -1;
 	}