Standardize command usage messages with cmd_usage()

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/main.c b/common/main.c
index 4c4f780..905d40f 100644
--- a/common/main.c
+++ b/common/main.c
@@ -1371,7 +1371,7 @@
 
 		/* found - check max args */
 		if (argc > cmdtp->maxargs) {
-			printf ("Usage:\n%s\n", cmdtp->usage);
+			cmd_usage(cmdtp);
 			rc = -1;
 			continue;
 		}
@@ -1415,7 +1415,7 @@
 	int i;
 
 	if (argc < 2) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}