Clean up untilfail executable

bin/untilfail

@@ -1,10 +1,8 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
 count=1
 echo "====> Attempt $count"
-$@
-(( count++ ))
-while [ $? -eq 0 ]; do
-  echo "====> Attempt $count"
-  $@
+while "$@"; do
   (( count++ ))
+  echo "====> Attempt $count"
 done