fix client_auth fail

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 2ba2d00..f556c0f 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -1813,7 +1813,7 @@
         goto decode_error;
     }
 
-    ssl->client_auth = 1;
+    ssl->handshake->client_auth = 1;
     return( 0 );
 
 decode_error:
@@ -1861,7 +1861,7 @@
     }
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
-                                ssl->client_auth ? "a" : "no" ) );
+                                ssl->handshake->client_auth ? "a" : "no" ) );
 
     mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_CERTIFICATE );