Revert "bugfix slMessage initialization"

This reverts commit 948626e8d16c62164e9e2c41784656e3ea0b18a9.

examples/src/opcuaServer.c

@@ -57,7 +57,7 @@ void server_run()
 {
 	UA_connection connection;
 
-	UA_ByteString slMessage = {-1,UA_NULL};
+	UA_ByteString slMessage = {NULL,0};
 
 	char optval = 1;
 	int sockfd, newsockfd, portno, clilen;