nmhw-auto-part: Now shows usage when presented with an unsupported argument.

BugzID: 54510

Signed-off-by: Lucien Mueller <lucien.mueller@netmodule.com>

recipes-support/nmhw-auto-part/nmhw-auto-part/nmhw-auto-part

@@ -296,7 +296,7 @@ execute(){
       touch /etc/nmhw-auto-part/overlay
       ;;
   *)
-      echo "Error: $ptype is not an option."
+      echo "$ptype is not an option."
       ;;
   esac
 
@@ -352,6 +352,12 @@ elif (( $# == 1 )) ; then
       description
       exit 0
       ;;
+    *)
+      echo "${0##*/} : $1 is not an option."
+      usage
+      description
+      exit 1
+      ;;
   esac
 elif (( $# == 4 )) ; then
       scripted_mode $1 $2 $3 $4