Fix intermittent s_server issues with ECDHE

Resolve a problem when using s_server with ECDHE cipher
suites in OpenSSL_1_0_1-stable.  Due to an uninitialized variable,
SSL_CTX_set_tmp_ecdh() is not always invoked within s_server. This bug
appears to have been introduced by
059907771b89549cbd07a81df1a5bdf51e062066.

Reviewed-by: Tim Hudson <tjh@openssl.org>

apps/s_server.c

@@ -998,7 +998,7 @@ int MAIN(int argc, char *argv[])
     int off = 0;
     int no_tmp_rsa = 0, no_dhe = 0, nocert = 0;
 #ifndef OPENSSL_NO_ECDH
-    int no_ecdhe;
+    int no_ecdhe = 0;
 #endif
     int state = 0;
     const SSL_METHOD *meth = NULL;