Correct the printf message of the DTLS handshake.
Make it consistent with dtls_server.c
diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index e18ee42..f271bad 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -203,7 +203,7 @@
     /*
      * 4. Handshake
      */
-    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    mbedtls_printf( "  . Performing the DTLS handshake..." );
     fflush( stdout );
 
     do ret = mbedtls_ssl_handshake( &ssl );