Standardize command usage messages with cmd_usage()

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/barco/barco.c b/board/barco/barco.c
index ed35572..e3abca4 100644
--- a/board/barco/barco.c
+++ b/board/barco/barco.c
@@ -292,7 +292,7 @@
 {
 #if 0
 	if (argc > 1) {
-		printf ("Usage:\n (%d) %s\n", argc, cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 #endif