Fix no-psk

Fixes #2847

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2856)
diff --git a/apps/s_server.c b/apps/s_server.c
index 57bae82..a6048fb 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -144,12 +144,12 @@
 #endif
 static int dtlslisten = 0;
 
+static int early_data = 0;
+
 #ifndef OPENSSL_NO_PSK
 static char *psk_identity = "Client_identity";
 char *psk_key = NULL;           /* by default PSK is not used */
 
-static int early_data = 0;
-
 static unsigned int psk_server_cb(SSL *ssl, const char *identity,
                                   unsigned char *psk,
                                   unsigned int max_psk_len)