force change state type

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index b1f5f36..e93e55b 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1408,7 +1408,7 @@
 static inline void mbedtls_ssl_handshake_set_state( mbedtls_ssl_context *ssl,
                                                     mbedtls_ssl_states state )
 {
-    ssl->state = state;
+    ssl->state = ( int ) state;
 }
 
 /*