Change ssl_set_psk() to act on ssl_config
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 0181a2f..494fa72 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1173,7 +1173,7 @@
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
-    if( ( ret = mbedtls_ssl_set_psk( &ssl, psk, psk_len,
+    if( ( ret = mbedtls_ssl_set_psk( &conf, psk, psk_len,
                              (const unsigned char *) opt.psk_identity,
                              strlen( opt.psk_identity ) ) ) != 0 )
     {