title: Alter message in Gerrit code review
body: <p>I've commited a branch to gerrit. Moderators have already approved my code but not merged it yet into the main repository. I tried altering the message on my commit but I keep getting strange errors. Here's what I've done:</p>
  
  <p>1) git checkout FETCH_HEAD     (to checkout the latest changes to a branch, I had to run repo sync after I commited my changes which undid my changes so had to fetch and checkout to get my changes back)</p>
  
  <p>2) git commit --amend
      *opens a text editor and I changed my message there</p>
  
  <p>3) repo upload</p>
  
  <p>When I try #3, it gives me this message: "no branches ready for upload"</p>
  
  <p>I thought my doing a checkout that my branch would be called FETCH_HEAD? Now, do I need to run the repo start   command again? Will this cause a new entry in the gerrit review system or will it just add a new patch? I don't want the moderators to have to think that I altered the files, thereby having them review everything again./ I just want to change the commit message, nothing else.</p>
  
  <p>Any ideas what I am doing wrong?</p>