[FIX] (util): add missing option in usage

util/csbucscheck.sh

@@ -50,7 +50,7 @@ cat << HERE
 This is <csbucscheck.sh>
 version: $VERSION
 
-usage: csbucscheck.sh [-v] [-d] [-r dir] dir 
+usage: csbucscheck.sh [-v] [-d] [-r dir] [-b bin] dir 
 or:    csbucscheck.sh -h
 
 Recurse into a csback maintained data directory tree and check all files