kconfig: config script: add a little user help

Give the user a clue about the problem along with the 35 lines of
usage/help text.

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: [email protected]
Signed-off-by: Masahiro Yamada <[email protected]>

Author: rddunlap

scripts/config

@@ -223,6 +223,7 @@ while [ "$1" != "" ] ; do
 		;;
 
 	*)
+		echo "bad command: $CMD" >&2
 		usage
 		;;
 	esac