[PATCH v2] kconfig: config script: add a little user help

[Randy Dunlap <rdunlap@xxxxxxxxxxxxx>]

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

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: linux-kbuild@xxxxxxxxxxxxxxx
---
v2: spell out "command" & send to STDERR; (Yamada-san)

 scripts/config |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20201218.orig/scripts/config
+++ linux-next-20201218/scripts/config
@@ -223,6 +223,7 @@ while [ "$1" != "" ] ; do
 		;;
 
 	*)
+		echo "bad command: $CMD" >&2
 		usage
 		;;
 	esac