Some minor struct optimizations.
diff --git a/include/mbedtls/ssl_ticket.h b/include/mbedtls/ssl_ticket.h
index 774a007..bb6cfe3 100644
--- a/include/mbedtls/ssl_ticket.h
+++ b/include/mbedtls/ssl_ticket.h
@@ -63,15 +63,15 @@
  */
 typedef struct mbedtls_ssl_ticket_context
 {
-    mbedtls_ssl_ticket_key keys[2]; /*!< ticket protection keys             */
     unsigned char active;           /*!< index of the currently active key  */
-
     uint32_t ticket_lifetime;       /*!< lifetime of tickets in seconds     */
 
     /** Callback for getting (pseudo-)random numbers                        */
     int  (*f_rng)(void *, unsigned char *, size_t);
     void *p_rng;                    /*!< context for the RNG function       */
 
+    mbedtls_ssl_ticket_key keys[2]; /*!< ticket protection keys             */
+
 #if defined(MBEDTLS_THREADING_C)
     mbedtls_threading_mutex_t mutex;
 #endif