tool/fmtck: gofmt err exit wrapper

The go devs in their infinite wisdom have decided that extending gofmt /
go fmt to error on exit is simply too complicated, so we have to script
away their inadequacies for them.

tool/fmtck.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+if test -n "$(gofmt -l "$@")";
+then
+    echo "[ERROR]: gofmt check errors"
+    gofmt -l "$@" | xargs -n1 printf '  > %s\n'
+    exit 1
+fi