use $USAGE instead of print_usage to print usage

There is no real functionality change other than
to remove calls to print_usage that is most cases
would have generated an error.

bin/chk-entry.sh

@@ -172,7 +172,7 @@ while getopts :hv:Vd:D:nNU:w: flag; do
     w)  ;;
     \?) echo "$0: ERROR: invalid option: -$OPTARG" 1>&2
 	echo 1>&2
-	print_usage 1>&2
+	echo "$USAGE" 1>&2
 	exit 3
 	;;
     :) echo "$0: ERROR: option -$OPTARG requires an argument" 1>&2